Hai dao động điều hòa có phương trình lần lượt là $x_1=3\cos\left(2\pi t+\dfrac{\pi}{2}\right)$ (cm) và $x_2=2\cos\left(2\pi t+\dfrac{\pi}{3}\right)$ (cm). Nhận định nào dưới đây là đúng?

Số electron tối đa trong phân lớp d là

Tiến hành mạ bạc cho một huy chương bằng kim loại đồng (copper) theo sơ đồ minh họa bên.

Phát biểu đúng là:

Nội dung nào sau đây không phải là lịch sử của ngôi trường mà em đang học?

Cho hàm số \(f(x)=x^{2}+4 x+2\).

Họ tất cả các nguyên hàm của hàm số \(f(x)\) là

Nhật Bản trở thành siêu cường tài chính số một của thế giới từ khi nào? 

Thời gian tiêm vaccine phòng bệnh tai xanh ở lợn thịt là

Read the following passage 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.

Mountain Lions Amid Wildfires: A Struggle for Survival

Beth Pratt, the California director for the National Wildlife Federation, has spent her career protecting Los Angeles’ mountain lions. These top predators live in a rocky area surrounded by fancy houses and many roads. When wildfires destroy vast stretches of open land, the survival options for these animals become critically limited. “This is the LA area—these mountain lions can’t just move into the Kardashians’ backyard,” Pratt says, her voice filled with concern for the animals in such a difficult situation.

(I) The chaparral vegetation, covering about 10% of California, is one of the world’s most flammable ecosystems. (II) In Los Angeles, suburban sprawl intrudes on these areas, blocking wildlife escape routes. (III)Fires strip the land of food and shelter, transforming vibrant ecosystems into barren landscapes. (IV) Pratt highlights the urgency of the situation, explaining how areas that once supported life are now “taken out of commission,” leaving many species to starve or struggle for survival.

The consequences extend beyond wildlife. Wildfires have caused devastating human losses, with 88,000 people evacuated and a rising death toll of 25. Meanwhile, the non-human world suffers equally, particularly endangered species with limited ranges. Red-legged frogs, reintroduced into Santa Monica streams in 2014, are among the most affected, with their habitats repeatedly destroyed. The Woolsey Fire of 2018 was followed by mudslides that wiped out much of the region's delicate ecosystem, and scientists fear similar outcomes this time. California newts, reptiles, and snakes are also at high risk, while mammals and birds, although more likely to escape, face challenges in finding food and shelter as the ecosystem bounces back.

Despite the devastation, hope remains. The chaparral is a fire-adapted ecosystem, and life often endures beneath the soil. Seeds can survive and germinate quickly, with grasses sprouting weeks after the first rain. Shrubs may take up to a decade to recover, depending on rainfall. Prof. Stefan Doerr, an expert on wildfires, emphasizes the resilience of this landscape, noting its evolutionary adaptation to high-intensity fires occurring every 30 to 100 years. While the aftermath looks bleak, these fires play a role in maintaining biodiversity, offering a glimmer of hope for recovery.

Which of the following best summarizes the main point of the passage?

Read the following advertisement 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 1 to 6. 

JOIN OUR CREATIVE WRITING WORKSHOP!

Do you have a passion for ___(1)___? Are you between 16 and 25 years old? Join our ___(2)___.

• ___(3)___ experience required

• Exciting weekly sessions

• Opportunity to publish your work

• Meet and learn from ___(4)___ authors. Register now ___(5)___ information.

• Email: writershub@literature.com

• Phone: 555-0234

• Address: 22 Inspiration Drive, Noveltown.

You’ll get to find great literature, meet fellow scribblers and build a writing habit, ___(6)___ your writing journey to the next level. Why wait? Enroll in our writing workshop today!

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. (1,5 points)

HEALTHY EATING MADE EASY!

Eating well is essential for a balanced life. Here are some tips to get you started:

• Include plenty of fruits and vegetables in your diet. You can find (7) _____ options at your local market.
• When cooking, try to (8) _____  unhealthy fats and sugar. Use fresh ingredients instead!
• Remember to drink enough water, (9) _______ it is crucial for your health and helps keep you energized.
• If you feel hungry between meals, reach for (10) _____ snacks like nuts or yogurt instead of chips.
• It’s important to have moderate food (11) _____. Overeating can lead to health (12) ______.
• Lastly, enjoy your meals with family or friends to make eating a joyful experience.

Read the following advertisement 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 1 to 6.

Humanitarian Imprints: Inspiring Stories Shaping 2025

Be Inspired. Take Action. Make Change.

Do you want to discover how ordinary people create extraordinary change in difficult global situations? The global (1)_________ conference will showcase amazing success stories from around the world. Join us for this life-changing experience!

Our passionate (2)_________ need your generous support to continue their vital mission abroad.

Meet brave volunteers (3)_________ communities recover from devastating natural disasters throughout developing countries. Our organization sends essential supplies (4)_________ affected populations during emergencies.

Let's (5)_________ it, we all have the power to change someone's life for the better every single day. We invite you to join our growing movement and start (6)_________ a meaningful difference in local communities today!

When: May 20-22, 2025

Where: Central Exhibition Hall

Time: 9:00 AM - 7:00 PM

Entry: Free admission

Contact us: info@humanitarianimprints.org | 555-789-0123

Together, we can build a better world!

Read the following passage 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.

The 22nd Southeast Asian Games were held in Vietnam from December 5th to 13th, 2003. It marked the first time Vietnam hosted such a significant sporting event, yet the Games were a great success. They became a grand festival that impressed sports enthusiasts with their spirit of solidarity, cooperation for peace, and development. The event demonstrated Vietnam's capability to unite the region through sports.

Athletes from 11 participating countries competed in 32 sports, winning a total of 444 gold medals. Teams in table tennis, badminton, karate, volleyball, basketball, and wrestling showcased some of the region’s top competitors. Notably, many records set during the Games were close to international standards. Vietnam emerged victorious, securing 158 gold medals and finishing at the top of the medal standings. Thailand came second with 90 golds, while Indonesia ranked third with 55. Singapore and Vietnam were the only nations with participants honored as the Most Outstanding Athletes in Swimming and Shooting events.

In football, the Vietnamese Women's Football team successfully defended their SEA Games title, a moment of pride for the host nation. In the Men's Football Final, Vietnam faced Thailand but lost, with the Thai team taking home the gold medal. Other sports, such as karate, athletics, bodybuilding, and wushu, saw young and talented Vietnamese athletes delivering exceptional performances and securing numerous gold medals. The strong performance of the athletes reflected Vietnam's growing prowess in the regional sports arena.

Vietnam’s first-place finish was not surprising. To prepare for the 22nd SEA Games, the country implemented an intensive training program for its athletes, involving both domestic and international facilities. Furthermore, the enthusiastic support from the Vietnamese people inspired the athletes to compete in high spirits. This success solidified Vietnam’s reputation as an excellent host for international sporting events. With this achievement, Vietnam has demonstrated its potential to host even larger competitions, such as the Asian Games, in the future.

Which of the following is NOT mentioned as one of the sports that Vietnam won gold medals in?

Tập xác định của hàm số \(y = \sqrt {4 - x} + \sqrt {x - 2} \) là?

Điền vào chỗ trống

Vào năm 2000, giá trị xuất nhập khẩu hàng hóa trên toàn thế giới đạt 13 101,4 tỷ USD, năm 2020 đã lên đến 35 532,5 tỷ USD. Vậy trong giai đoạn 2000 - 2020, giá trị xuất nhập khẩu hàng hóa trên thế giới tăng bao nhiêu lần? (Làm tròn đến số thập phân thứ nhất của lần)

Đáp án:...........

Mỗi công dân cần làm gì để bảo vệ, tham gia xây dựng chính quyền ở cấp địa phương?

Cho các phép lai sau:

(1) Ab/ab × aB/ab; (2) Ab/aB × aB/Ab; (3) AB/ab × Ab/aB; (4) Ab/aB × aB/ab; (5) AB/ab × AB/ab; (6) AB/ab × aB/ab

Trong trường hợp mỗi gen qui định một tính trạng, quan hệ trội lặn hoàn toàn. Có bao nhiêu phép lai ở đời con cho tỉ lệ phân li kiểu hình 1:2:1 và khác với tỉ lệ kiểu gen?

Hoạt động tạo ra sản phẩm vật chất và tinh thần quyết định tạo ra sản phẩm vật chất và tinh thần quyết định sự tồn tại phát triển của con người và xã hội gọi là gì?

Lệnh cấm vận đối với Cộng hòa Nam Phi được bãi bỏ vào thời gian nào sau đây?

Với những đóng góp của mình, Đỗ Phủ được mệnh danh là?

Tín hiệu tương tự được phân loại dựa trên tính chất thời gian của tín hiệu như sơ đồ dưới đây. 

Miền nghiệm của hệ bất phương trình \(\left\{ \begin{align} 2x+3y-6<0 \\ x\ge 0 \\ 2x-3y-1\le 0 \\ \end{align} \right.\) chứa điểm nào sau đây?