Read the following passage about smart growth and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.
Smart Growth
Recently, experts have tried to curb the spread of suburban sprawl, or at least create urban areas that are developed more purposefully. This is known as "smart growth." City planners create communities that are designed for more walking and less dependency on cars. Some developers recover old communities in downtown urban areas, rather than develop the next piece of farmland or wilderness.
U.S. states such as Oregon are passing laws to prevent unplanned urban sprawl. They have created boundaries around cities that limit the growth of development. Officials have created laws stating that the minimum size of a plot of land is 32 hectares (80 acres). This is to prevent developers from creating suburban communities. An 80-acre plot of land is financially impractical for a single-family home!
Other smart-growth communities are creating new types of development. Some have large amounts of undeveloped "green space," organic farms, and lakes. Urban areas typically drain the water from rain and snow, which cannot collect in the paved-over grounD. Rather than use drainage pipes and ditches, smart-growth communities create wetlands designed to filter storm runoff.
More city planners are developing urban areas by considering their geography. Engineers construct buildings that integrate seamlessly with the surrounding environment, drawing upon natural resources. White roofs, for example, reflect the sun's rays and lower the cost of air conditioning. Homebuilders in urban areas as diverse as Los Angeles, California, U.S., and the island communities of Greece create homes and businesses with white plaster or tile roofs for this reason.
There is also a move toward preserving and maintaining more green areas and planting more trees in urban areas. Landscape designers often consult with city planners to incorporate parks with development.
Which of the following best paraphrases the underlined sentence in paragraph 4?
The rapid growth gradually leads people toward using natural energy sources and sustainable structures instead of artificial constructions
Over time, people have consistently built structures that integrate with the natural environment and efficiently make use of natural energy sources.
Structures are optimally designed to blend with the natural environment while effectively utilizing available natural resources
Engineers have created impressive structures that integrate with nature, efficiently using available resources alongside advanced human technology.
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Đáp án đúng là C
Giải thích :
A. Sự tăng trưởng nhanh chóng dần dẫn dắt con người hướng tới việc sử dụng các nguồn năng lượng tự nhiên và các công trình bền vững thay vì các công trình nhân tạo.
B. Theo thời gian, con người đã liên tục xây dựng các công trình hòa nhập với môi trường tự nhiên và tận dụng hiệu quả các nguồn năng lượng tự nhiên.
C. Các công trình được thiết kế tối ưu để hòa hợp với môi trường tự nhiên trong khi sử dụng hiệu quả các tài nguyên thiên nhiên có sẵn.
D. Các kỹ sư đã tạo ra các công trình vĩ đại tích hợp với thiên nhiên, sử dụng hiệu quả các tài nguyên có sẵn cùng với các công nghệ tiên tiến của con người.
- “Engineers construct buildings that integrate seamlessly with the surrounding environment, drawing upon natural resources.”
=> C. Structures are optimally designed to blend with the natural environment while effectively utilizing available natural resources
Bộ đề thi giúp học sinh lớp 12 làm quen với cấu trúc và nội dung đề thi tốt nghiệp THPT môn Tiếng Anh năm 2025. Đề thi được xây dựng theo định hướng của Bộ GD ĐT, bao gồm các phần Ngữ âm, Từ vựng - Ngữ pháp, Chức năng giao tiếp, Kỹ năng đọc hiểu, Kỹ năng viết và Phát âm - Trọng âm. Hệ thống câu hỏi đa dạng, bám sát chương trình học, giúp học sinh rèn luyện kỹ năng làm bài và nâng cao tư duy ngôn ngữ. Đáp án chi tiết đi kèm hỗ trợ học sinh tự ôn tập, đánh giá năng lực và chuẩn bị tốt nhất cho kỳ thi quan trọng.
Câu hỏi liên quan
Read the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.
To Save the Planet, Begin at Home!
Let's look at what we can do at home each day to save the planet.
Facts and figures:
- Farming with synthetic chemicals has killed insects and (7) __________ animals. Meanwhile, we (8) __________ 80 million cans each day and 45,000 tonnes of plastic packaging each year. These kill up to one million seabirds a year.
Positive action!
- Buy and consume fresh, organic food and drinks, especially things produced locally. This reduces the need for long-distance food (9) __________.
- Don't always buy food that comes in cans or plastic packaging. (10) __________ buying a pre-packaged sandwich, make your own! That helps reduce the (11) __________ of rubbish you produce.
- Reuse packaging where possible. Separate paper, plastic, and metal (12) __________ and recycle them.
(Adapted from Move on)
Question 7: Farming with synthetic chemicals has killed insects and (7) __________ animals.
Read the following passage about smart growth and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.
Smart Growth
Recently, experts have tried to curb the spread of suburban sprawl, or at least create urban areas that are developed more purposefully. This is known as "smart growth." City planners create communities that are designed for more walking and less dependency on cars. Some developers recover old communities in downtown urban areas, rather than develop the next piece of farmland or wilderness.
U.S. states such as Oregon are passing laws to prevent unplanned urban sprawl. They have created boundaries around cities that limit the growth of development. Officials have created laws stating that the minimum size of a plot of land is 32 hectares (80 acres). This is to prevent developers from creating suburban communities. An 80-acre plot of land is financially impractical for a single-family home!
Other smart-growth communities are creating new types of development. Some have large amounts of undeveloped "green space," organic farms, and lakes. Urban areas typically drain the water from rain and snow, which cannot collect in the paved-over grounD. Rather than use drainage pipes and ditches, smart-growth communities create wetlands designed to filter storm runoff.
More city planners are developing urban areas by considering their geography. Engineers construct buildings that integrate seamlessly with the surrounding environment, drawing upon natural resources. White roofs, for example, reflect the sun's rays and lower the cost of air conditioning. Homebuilders in urban areas as diverse as Los Angeles, California, U.S., and the island communities of Greece create homes and businesses with white plaster or tile roofs for this reason.
There is also a move toward preserving and maintaining more green areas and planting more trees in urban areas. Landscape designers often consult with city planners to incorporate parks with development.
In which paragraph does the writer explain how smart growth communities manage stormwater?
Read the following advertisement and choose the correct option that best fits each of the numbered blanks.
Exciting Job Opportunity at Our Community Centre!
The Sunshine Community Center is looking for enthusiastic students to join our dynamic team.
The job includes:
- Organising community events and activities
- Assisting in (10) __________ tasks
- Helping with social media updates
✔ No (11) __________ prior experience needed!
Contact Mr. Brown at brown.james@communitycenter.org by May 15 to apply.
Don't miss (12) __________!
Read the following announcement and choose the correct option that best fits each of the numbered blanks.
Career Orientation Workshop Announcement
Dear Students,
We are excited to announce that our school will be holding a Career Orientation Workshop on November 15th. This workshop aims (13) __________ you explore different career paths and gain valuable insights into the job market. Industry experts will be present to guide you through career opportunities, answer your questions, and provide advice on how to prepare (14) __________ your future career.
Don't miss this chance to discover your potential and (15) __________ clear goals for your future career!
Date: November 15th
Time: 9:00 AM - 11:00 AM
Location: School Auditorium
We look forward to seeing you there!
Read the following announcement and choose the correct option that best fits each of the numbered blanks.
Career Orientation Workshop Announcement
Dear Students,
We are excited to announce that our school will be holding a Career Orientation Workshop on November 15th. This workshop aims (13) __________ you explore different career paths and gain valuable insights into the job market. Industry experts will be present to guide you through career opportunities, answer your questions, and provide advice on how to prepare (14) __________ your future career.
Don't miss this chance to discover your potential and (15) __________ clear goals for your future career!
Date: November 15th
Time: 9:00 AM - 11:00 AM
Location: School Auditorium
We look forward to seeing you there!
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 18 to 19.
In 2022, an ambitious environmental project, which was designed to combat deforestation, ___(18)___. The project aimed to restore large areas that had been devastated by illegal logging and agricultural expansion, with the goal of planting over one million trees. This initiative marked a crucial step in global efforts to mitigate climate change, drawing significant attention from environmental organizations worldwide.
Having decided to employ advanced AI systems during the project, ___(19)___. These systems ensure that optimal conditions are maintained for tree growth and wildlife restoration, making the reforestation process more efficient. The AI not only gathers data from the ecosystem for further research but also interacts with the surrounding environment to support long-term sustainability, thus helping restore Amazon's ecological balance.
Choose the correct arrangement of the sentences to make a meaningful paragraph/letter in each of the following questions.
a. I am confident that my friendly attitude and communication skills will help me perform well in this role.
b. Dear Sir/Madam, I am writing to apply for the part-time position as a shop assistant at your store.
c. I have previous experience working as a cashier at a local grocery store, where I assisted customers and maintained the store's organization.
d. I would appreciate the opportunity to discuss my application in person and am available for an interview any afternoon.
e. Yours faithfully,
f. Thank you for considering my application. I look forward to hearing from you soon.
Read the following leaflet and mark the letter A, B, C, or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.
Small Steps, Big Impact: Sustainable Living Tips
Making small changes in our daily routines can have a significant effect on our planet. Let's see what you can do to make a difference every day.
♻ Eye-Opening Facts
Worldwide, over 300 million tons of plastic are produced each year, and (7) _______ single-use plastic items are among the most harmful to our oceans. We (8) _______ billions of plastic bottles and bags annually, most of which end up in landfills or the sea, threatening wildlife.
♻ How You Can Help
• Buy fresh, unpackaged fruits and vegetables instead of those wrapped in plastic. Supporting local farmers decreases transport (9) _______ and promotes sustainable farming.
• Make homemade meals whenever possible. (10) _______ buying pre-packaged snacks, prepare your own to reduce waste.
• Use a cloth shopping bag. This decreases the (11) _______ of disposable bags in circulation.
• Recycle as much as you can. Sort your waste into (12) _______ like paper, metal, and plastic, and drop them off at local recycling facilities.
Read the following passage about the urban shift and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.
[I] Landslides are a significant environmental challenge in the northern mountainous provinces of Vietnam, partiCularly during the rainy season. The region, characterized by steep slopes and heavy rainfall, is prone to this natural disaster, which poses serious threats to both the local population and infrastructure. [II] ln recent years, numerous landslides have occurred, often triggered by prolonged periods of heavy rain, resulting in devastating impacts on communities and livelihoods.
The mountainous terrain, combined with deforestation and improper land use, exacerbates the risk of landslides. [III] As farmers clear forests for agriculture, the natural vegetation that stabilizes the soil is lost, making slopes more susceptible to erosion. When heavy rains saturate the soil, it can quickly become unstable, leading to sudden and destructive landslides. [IV]
In response to this growing threat, local authorities and environmental organizations are taking proactive measures to mitigate the risks associated with landslides. Efforts include reforestation projects, improving drainage systems, and raising public awareness about safe practices du ring the rainy season. Additionally, advanced monitoring systems are being implemented to provide early warnings, allowing communities to evacuate before a disaster strikes.
Despite these efforts, the challenges remain significant, and ongoing education and support for sustainable land management practices are crucial for reducing the incidence and impact of landslides in northern Vietnam.
Which of the following can be inferred from the passage?
Read the following passage and choose the option that best fits each of the numbered blanks from 18 to 22.
Choosing a career is a significant decision (18) __________. With so many options available, finding the right path can feel overwhelming. However, by considering key factors such as interests, skills, job market trends, and financial stability, you can make a well-informed choice.
First, it is important to reflect on your interests and passions. Think about what activities bring you joy and what topics naturally attract your attention. When you pursue a career that aligns with your passions, work becomes more enjoyable and rewarding. For example, someone fascinated by technology (19) __________.
In addition to interests, understanding your skills and strengths can help guide your decision. Consider what tasks you excel at and what comes naturally to you. (20) __________, careers in finance, engineering, or data science might be a great fit. Recognizing your strengths allows you to choose a career where you can thrive and achieve success.
Beyond personal preferences, researching job market trends is essential. (21) __________. In recent years, careers in technology, artificial intelligence, and sustainability have been on the rise, offering promising opportunities.
Finally, financial security is a key consideration. While following your passion is important, (22) __________. Understanding salary expectations, job benefits, and advancement opportunities can help you make a practical decision.
By carefully evaluating these factors, you can choose a career path that not only aligns with your passions and skills but also ensures long-term stability and success.
Read the following passage about smart growth and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.
Smart Growth
Recently, experts have tried to curb the spread of suburban sprawl, or at least create urban areas that are developed more purposefully. This is known as "smart growth." City planners create communities that are designed for more walking and less dependency on cars. Some developers recover old communities in downtown urban areas, rather than develop the next piece of farmland or wilderness.
U.S. states such as Oregon are passing laws to prevent unplanned urban sprawl. They have created boundaries around cities that limit the growth of development. Officials have created laws stating that the minimum size of a plot of land is 32 hectares (80 acres). This is to prevent developers from creating suburban communities. An 80-acre plot of land is financially impractical for a single-family home!
Other smart-growth communities are creating new types of development. Some have large amounts of undeveloped "green space," organic farms, and lakes. Urban areas typically drain the water from rain and snow, which cannot collect in the paved-over grounD. Rather than use drainage pipes and ditches, smart-growth communities create wetlands designed to filter storm runoff.
More city planners are developing urban areas by considering their geography. Engineers construct buildings that integrate seamlessly with the surrounding environment, drawing upon natural resources. White roofs, for example, reflect the sun's rays and lower the cost of air conditioning. Homebuilders in urban areas as diverse as Los Angeles, California, U.S., and the island communities of Greece create homes and businesses with white plaster or tile roofs for this reason.
There is also a move toward preserving and maintaining more green areas and planting more trees in urban areas. Landscape designers often consult with city planners to incorporate parks with development.
The phrase "financially impractical" in paragraph 2 could be best replaced by __________.
Read the following advertisement and choose the option that best fits each of the numbered blanks from 1 to 6.
DISCOVER YOUR IDEAL CAREER WITH CAREER PATH FINDER
Choosing the right career can be (1) __________, but Career Path Finder makes it easier! Our website offers valuable tools to help you explore career options before (2) __________ a decision.
One of its key features is the Career Assessment Test, (3) __________ your skills, interests, and personality to suggest suitable career paths. If you're unsure where to start, this test provides personalized recommendations (4) __________ your strengths. Another helpful feature is the Job Market Insights (5) __________. Here, you can research salary expectations, job demand, and future trends in different industries. This ensures you choose a career with good growth potential and stability. Additionally, the Resume and Interview Guide helps you prepare (6) __________ job applications with expert tips.
Visit our website today and take the first step toward a fulfilling career!
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 18 to 19.
In 2022, an ambitious environmental project, which was designed to combat deforestation, ___(18)___. The project aimed to restore large areas that had been devastated by illegal logging and agricultural expansion, with the goal of planting over one million trees. This initiative marked a crucial step in global efforts to mitigate climate change, drawing significant attention from environmental organizations worldwide.
Having decided to employ advanced AI systems during the project, ___(19)___. These systems ensure that optimal conditions are maintained for tree growth and wildlife restoration, making the reforestation process more efficient. The AI not only gathers data from the ecosystem for further research but also interacts with the surrounding environment to support long-term sustainability, thus helping restore Amazon's ecological balance.
Choose the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.
Dear Uncle Sam,
I hope you're doing well!
a. After a lot of thought, I feel this is the right path for me, and I'm really excited to start this new journey.
b. Since you have so much experience and wisdom, I would love to hear your thoughts on this career choice.
c. I wanted to share some exciting news with you: I've decided to pursue a career in fashion design.
d. Your perspective would really help as I take this next step.
e. Any advice on how to get started, what skills I should focus on, or how to navigate the industry would mean a lot to me.
Looking forward to hearing from you!
Mia
Read the following passage and choose the correct answer to each of the questions.
1. Have you ever checked to see what the weather would be like for the week? You can thank meteorologists for the weather forecast! A meteorologist is a scientist who studies the atmosphere to predict the weather. Their work involves observing weather patterns, analysing data from satellites and weather stations, and using computer models to forecast future weather conditions. Meteorologists play a crucial role in helping people prepare for various everyday conditions as well as providing timely warnings about extreme weather events like hurricanes and tornadoes.
2. To become a meteorologist, one typically needs a degree in meteorology or a related field like atmospheric science. Many meteorologists also study physics, mathematics, and computer science, as these subjects are essential for understanding and predicting weather patterns. Some meteorologists work in research, studying climate change and developing new forecasting models. Others work in broadcasting, delivering weather reports on television or radio.
3. Meteorologists often work in offices, but they may also spend time in the field, gathering data and monitoring weather conditions firsthand. The job can be challenging, as weather is unpredictable, and forecasts are not always accurate. However, it is also rewarding, as accurate weather predictions can save lives and property by providing timely warnings of severe weather.
4. The work of a meteorologist is never dull, as they must constantly keep up with new developments in weather technology and science. Whether they are tracking a major storm or predicting a sunny day, meteorologists help people plan their activities and stay safe.
(27) Which of the following could be the best title for the passage?
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 31 to 40.
Sustainable development has become a priority worldwide, as nations work to balance economic growth with environmental preservation. [I] Sustainable practices are critical to ensure that natural resources are conserved for future generations, while also meeting today’s economic needs. [II] Many countries have invested in green technologies to reduce carbon emissions and slow climate change.
[III] However, achieving sustainability involves more than just technology; it requires a collective shift in mindset towards reducing waste, reusing materials, and protecting biodiversity. [IV] According to the United Nations, sustainable development must incorporate social equity, economic progress, and environmental stewardship to be effective.
A key factor driving sustainability efforts is the awareness of limited resources. The earth’s resources, such as freshwater, fossil fuels, and fertile land, are finite, and overuse can lead to scarcity. In recent years, many nations have implemented regulations to control the extraction and consumption of resources, aiming to curb excessive demand and reduce environmental impact. For example, many cities have introduced restrictions on single-use plastics and have promoted recycling programs as a means to encourage responsible waste management.
While developing countries may prioritize industrial growth to boost economic development, developed nations often focus on reducing their carbon footprint and promoting eco-friendly policies. This disparity can lead to challenges in international relations, as countries negotiate agreements on emissions and resource use. Organizations like the United Nations work to bridge these gaps through global frameworks that encourage cooperation, but disparities in priorities and resources can hinder progress.
Increasing public awareness about environmental sustainability has been another critical component of these efforts. Through education and media campaigns, individuals are encouraged to adopt environmentally conscious practices, such as reducing energy consumption, using public transport, and supporting local economies. By making small adjustments in daily life, individuals contribute to broader global sustainability goals, ultimately promoting a healthier planet for future generations.
The word finite in paragraph 2 could be best replaced by _______ .
Read the following passage and choose the correct answer to each of the questions.
1. In recent years, the idea of a six-hour workday has gained attention as a potential solution to modern work-life balance challenges. Sweden is one of the countries where this concept was tested, and the results have been eye-opening.
2. In 2015, a Swedish retirement home introduced a six-hour workday for its nurses. After the experiment, not only were the nurses happier and more energetic, but productivity also increased. The reduced working hours allowed employees to focus better during their shifts, leading to fewer mistakes and better care for patients. Moreover, absenteeism decreased, and employee satisfaction skyrocketed.
3. But how does a shorter workday improve productivity? Research suggests that the traditional eight-hour workday may lead to exhaustion, which causes workers to lose focus and make errors. By working fewer hours, they can maintain higher energy levels and complete tasks more efficiently. Studies from organizations like the OECD (Organisation for Economic Co-operation and Development) also show that countries with shorter average working hours, such as Germany and the Netherlands, have higher productivity rates compared to those with longer working hours.
4. Critics argue that a six-hour workday may not be suitable for all industries, and some businesses worry about potential cost increases. However, many proponents believe the long-term benefits, such as improved employee well-being and reduced burnout, outweigh these concerns.
5. As work-life balance becomes a priority in today's society, the six-hour workday could be a glimpse into the future of work, where employees are happier, healthier, and more productive.
(29) What does the passage mainly discuss?
Read the following passage and choose the best answer to each of the following questions from 23 to 30.
1. Many young Australians are uncertain about which career path to choose after school. With the rise of technology, including automation and artificial intelligence, some jobs may disappear, but new opportunities will also emerge. Existing jobs will evolve, requiring workers to adapt to new roles and skills. It's essential for young people to understand these changes and plan their careers accordingly to stay competitive in the future job market.
2. Technology is rapidly changing how we work. Jobs that involve repetitive tasks, such as data entry or reception work, are more likely to be replaced by machines. However, those that require human creativity, problem-solving, and communication skills will continue to be in demand. Fields like healthcare, education, and design are expected to see significant growth.
3. Another important factor is that young Australians will likely change careers multiple times throughout their lives. Studies show that today's teenagers could switch jobs around 17 times and work in five different careers. This underscores the need for flexibility and the ability to learn new skills. Being open to change and willing to develop new abilities will be vital for long-term career success in the evolving job market.
4. Although a university degree can help open doors, it is no longer enough on its own. Employers are increasingly looking for skills like teamwork, critical thinking, and effective communication. Gaining work experience, even through part-time jobs, internships, or volunteer work, will be essential. These experiences will help develop the practical skills that employers value and prepare young Australians for a successful career in the future workforce. By focusing on continuous learning and skill development, they can seize the opportunities that lie ahead.
The word those in paragraph 2 refers to __________.
Read the following leaflet and mark the letter A, B, C, or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.
Small Steps, Big Impact: Sustainable Living Tips
Making small changes in our daily routines can have a significant effect on our planet. Let's see what you can do to make a difference every day.
♻ Eye-Opening Facts
Worldwide, over 300 million tons of plastic are produced each year, and (7) _______ single-use plastic items are among the most harmful to our oceans. We (8) _______ billions of plastic bottles and bags annually, most of which end up in landfills or the sea, threatening wildlife.
♻ How You Can Help
• Buy fresh, unpackaged fruits and vegetables instead of those wrapped in plastic. Supporting local farmers decreases transport (9) _______ and promotes sustainable farming.
• Make homemade meals whenever possible. (10) _______ buying pre-packaged snacks, prepare your own to reduce waste.
• Use a cloth shopping bag. This decreases the (11) _______ of disposable bags in circulation.
• Recycle as much as you can. Sort your waste into (12) _______ like paper, metal, and plastic, and drop them off at local recycling facilities.
Read the following passage about environmental pollution and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.
Since the early 1980s, people have become more aware of the serious effects of large-scale pollution on the environment. This kind of pollution often happens because of poor planning in developing countries or the short-sighted policies of some industrialized nations. These countries use up a large portion of the world’s natural resources, even though only a small part of the world’s population lives there.
Events like the Great Smog of London, the destruction of the Amazon rainforest and the nuclear accident at Chernobyl have received a lot of media attention, as have other acts that harm the environment. However, it’s important to remember that not all pollution is on such a large scale. In fact, a lot of pollution comes from sources closer to home. For instance, a recent oil spill from a tanker in Sydney accidentally released oil into the harbor. This not only damaged the surrounding area but also created toxic fumes that hung over the nearby suburbs for days, leaving residents frustrated and questioning how such a disaster could happen.
Protecting ourselves from pollution can feel like a never-ending task. We try to avoid breathing in traffic fumes, stay away from industrial areas, and wear masks when cycling. All of this might make some people feel safest at home. However, new research shows that staying indoors is not always better. Studies indicate that levels of harmful gases, dust, and other chemicals are often higher indoors than outdoors, even in polluted cities. Since most people spend more time inside than outside, some experts think we may need to pay more attention to indoor pollution to improve public health.
In conclusion, awareness of environmental pollution has grown since the 1980s due to major incidents and local sources of harm. While large-scale events like Chernobyl capture attention, everyday issues, including indoor pollution, also pose serious health risks. Addressing both is vital for public health and environmental protection.
In the sentence, "This not only damaged the surrounding area but also created toxic fumes that hung over the nearby suburbs for days," what does "This" refer to?