Sóng vô tuyến truyền trong không trung với tốc độ  $3\cdot {10}^8\text{ m}/\text{s}$. Một đài phát sóng radio có tần số  ${10}^6\text{ Hz}$. Bước sóng của sóng radio này là

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

There used to be a theatre here. It was tom down a few years ago.

a. One useful suggestion is to reduce the use of private cars and choose public transport instead, which helps to lower air pollution and decrease traffic problems in cities.

b. In the long term, following such suggestions can lead to a more sustainable and responsible way of living.

c. These actions not only protect the planet but also create cleaner and healthier communities for people.

d. Another effective idea is to recycle materials such as paper, glass, and plastic, so that natural resources are saved and less waste is produced.

e. Improving the environment requires small but important changes in daily life.

Mỗi luận điểm nên được trình bày như thế nào trong một bài văn?

Điểm khác biệt của Nhật Bản so với Việt Nam giữa thế kỉ XIX là

Có bao nhiêu yêu cầu cơ bản đối với người lao động của một số ngành nghề phổ biến trong chăn nuôi?

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

He lacked commitment to the job. He wasn't considered for promotion.

Read the following passage about the Exploring The Universe 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.

Science is a vast and fascinating field that seeks to understand the natural world and the universe beyond[I]. It encompasses various disciplines, including physics, chemistry, biology, and astronomy[II]. Each of these areas contributes to our understanding of complex phenomena, [III]. For instance, scientific research has led to significant breakthroughs in medicine, renewable energy, and environmental conservation[IV]. In this essay, we will explore the impact of science on our lives, particularly focusing on space exploration.

One of the most intriguing aspects of science is space exploration. Humans have always looked to the stars, wondering what lies beyond our planet. The launch of satellites and manned missions has allowed us to gather valuable information about the cosmos. For example, NASA's Mars Rover has provided insight into the potential for life on other planets. Through meticulous research and data collection, scientists can analyze soil samples and atmospheric conditions, paving the way for future explorations.

Space exploration also raises critical questions about our existence and the future of humanity. As we continue to advance technologically, the prospect of colonizing other planets becomes more plausible. This endeavor could serve as a solution to the challenges we face on Earth, such as overpopulation and resource depletion. However, ethical considerations must guide these efforts. We must ensure that we do not repeat the mistakes of history, such as the exploitation of natural resources and indigenous populations.

Moreover, scientific advancements have enabled us to develop technologies that enhance our understanding of the universe. Telescopes and space probes allow us to observe distant galaxies, study black holes, and uncover the mysteries of dark matter. Each discovery leads to new questions, further fueling our curiosity and drive for knowledge. The concept of the multiverse, for instance, challenges our understanding of reality and pushes the boundaries of scientific thought.

In addition to exploring the universe, science plays a crucial role in addressing pressing issues on Earth. Climate change, for example, is a significant concern that scientists are actively investigating. Through climate models and data analysis, researchers can predict future trends and propose solutions to mitigate the effects of global warming. Public awareness and education are essential in fostering a collective response to environmental challenges.

As we reflect on the wonders of science, it is clear that its contributions extend far beyond mere knowledge acquisition. Science empowers us to make informed decisions about our health, environment, and future. By fostering a culture of curiosity and critical thinking, we can inspire future generations to continue exploring the unknown.

Where in paragraph 1 does the following sentence best fit?

enabling advancements that improve our daily lives

Lithium có hai đồng vị bền trong tự nhiên, trong đó đồng vị $^6_3Li$ chiếm 7,5% tổng số nguyên tử. Biết nguyên tử khối trung bình của lithium là 6,925, số khối của đồng vị còn lại là

Read the following passage about endangered languages 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.

AVICII’S LIFE AFTER REHAB

Once he completed his month in rehab, Avicii seemed to have a new outlook on life. He was meditating regularly, reading about the collective unconscious, and got a puppy. After not performing for a long period of time, he returned to the stage in 2016 at Miami’s Ultra Music Festival. It was announced a few days after this gig that he would not be performing live anymore. Avicii chose to not perform so that he could focus on bettering his mental health.

Despite appearing to have new-found stability, Avicii still struggled to deal with his mental health issues. While continuing to suppress the anxiety and depression that he frequently felt, Avicii also started to become disinterested in his music career. During this time, he was smoking and drinking on occasion which may have resulted in a resurgence of his disassociation feelings.

He told Tereza Kacerova, his girlfriend at the time, “What if everyone around me is just a projection in my mind? Sometimes I just think these things. About how nothing really matters.”

Avicii started to focus heavily on meditation which he found to be helpful in clearing the “nonsense” from his mind. He believed that a deep form of meditation taught by Maharishi Mahesh Yogi was a way to exercise his brain which he had decided would lead to his happiness. Despite this form of meditation typically being done in 20 minutes increments, Avicii would sometimes spend full days meditating in an attempt to reach enlightenment faster.

What can be inferred about Avicii's mental state after rehab?

Cho mệnh đề: "Nếu $n$ là một số nguyên tố lớn $3$ thì $n^2 + 20$ là một hợp số". Mệnh đề nào sau đây tương đương với mệnh đề đã cho?

Sản phẩm chăn nuôi nào dưới đây không được dùng làm thực phẩm?

Để giảm thiểu phát thải các khí nhà kính, Hoa Kì chú ý biện pháp gì?

Cơ thể động vật không lấy từ môi trường sống chất nào sau đây?

Hình ảnh nào cho thấy cây bị héo do nắng nóng?

Tại sao vào mùa đông, động vật biến nhiệt sinh trưởng và phát triển chậm hơn?

Read the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that bestfits each of the numbered blanks from 7 to 12. 

HEALTHY EATING HABITS

Let's explore how we can improve our eating habits for a healthier lifestyle.

Facts and figures.

Many people consume much sugar and unhealthy fats every day. In fact, studies show that we (7) _____ over 200 grams of sugar daily, which can lead to (8) _____ health issues.

Positive actions!

• Choose whole foods and fresh products. This helps reduce the intake of (9) _____ additives that can be harmful to your health.

• (10) _____ buying sugary snacks, make your own healthy snacks at home! Preparing your meals can help control the (11) _____ of sugar and salt you consume.

• Drink plenty of water. Limit your intake of sugary drinks and (12) _____ to maintain a balanced diet.

Hãy cho biết ý nào sai: Khi nói về kích thước của quần thể sinh vật?

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 STAY HEALTHY, BEGIN AT HOME!

Let’s look at what we can do each day to improve our health and well-being.

Facts and Figures:

Over 30% of adults do not get enough physical activity, and (7)_______ spend hours sitting in front of screens, which affects both their physical and mental health.

Positive Actions!

(8)________  your intake of sugary or salty processed foods and opt for healthier alternatives like fruits or nuts.

Focus on (9)________ fresh, nutrient-rich foods rather than heavily processed ones. This not only nourishes your body but also helps the environment by reducing (10)________.

(11)_________ how busy your schedule is, dedicate at least 30 minutes a day to physical activity. Consistency is key!

Start Today!

Small changes can lead to big (12)_______. Make the choice to live a healthier, happier life!