Đạo hàm của hàm số \(y={{\sin }^{2}}2x\) là:

Chọn câu đúng. Tia laze được dùng 

Chức năng nào bên dưới phù hợp với thiết bị số thông minh?

Xã hội thông tin là hoạt động gì?

Nội dung nào sau đây không phản ánh đúng vai trò của tri thức lịch sử đối với cuộc sống của con người?

Read the passage carefully

1. Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

2. The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

3. On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't  agree.

4. What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

5. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

Choose an option (A, B, C, or D) that best answers each question:

What does the word “they” in paragraph 2 refer to?

Read the following passage about fitness trends 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.

FITNESS TRENDS

[I] Reformer Pilates is an advanced and more intense variation of traditional Pilates. [II] Since this type of equipment isn’t something you would typically have at home, you’ll need to visit a specialized Pilates center to try it. [III] While it might look easy at first, don’t be fooled - by the end of the session, your thighs will be burning, and you might struggle to walk up or down stairs for a few days afterward. [IV] This workout pushes your body to its limits, providing a more challenging experience than standard Pilates, and many find it an effective way to build both strength and flexibility.

Trampolining is another popular fitness trend, and although it may seem like child's play, it’s actually a highly effective workout. Jumping up and down on a trampoline can leave you feeling exhausted after just a few minutes. Surprisingly, it’s even better for heart health than running, while also improving coordination and helping to reduce stress levels. Trampolining is gaining widespread popularity, with new centers popping up that feature as many as 150 trampolines. These facilities offer options for everyone: you can enjoy 'freejumping,   where you bounce without an instructor, or pay for professional lessons to learn the best techniques and get the most out of your workout. Many people are discovering that trampolining combines fun and fitness in a way that makes staying active much more enjoyable.

If you're someone who is typically active but feeling down or emotionally drained, Dynamic Running Therapy might be just what the doctor ordered. This trend involves running with a therapist, combining the benefits of physical exercise with talk therapy. Though these sessions are often more expensive than typical therapy sessions because of the professional fees, they offer significant advantages. Running while talking helps distract you from any discomfort, allowing you to cover longer distances, and creates a relaxed, open environment that can make it easier to talk compared to the usual therapist’s office setting.

Which of the following can be inferred from the passage?

Ngân sách Nhà nước được đặt dưới sự giám sát trực tiếp của cơ quan quyền lực nào?

Cấp độ tổ chức sống nào dưới đây không có ở sinh vật đơn bào?

Khi sử dụng lại các thông tin trên mạng cần lưu ý đến vấn đề nào?

Cặp đồ thị nào ở hình dưới đây là của chuyển động thẳng đều?

Theo định luật Ôm cho toàn mạch thì cường độ dòng điện cho toàn mạch tỉ lệ nghịch với?

Hình ảnh dưới đây mô tả một giai đoạn trong quá trình phân bào ở một loài động vật. Theo lý thuyết, có bao nhiêu phát biểu dưới đây là chính xác?

Xác định kết quả của giá trị x sau khi thực hiện đoạn chương trình sau:

a=16

b=17

x=abs(a-b)

Đất trồng có nhóm tính chất nào sau đây?

Số proton và số neutron trong hạt nhân nguyên tử \(_{80}^{201}X\) là

Phần tô màu (không bao gồm đường thẳng) trong hình vẽ là miền nghiệm của bất phương trình nào sau đây?

Theo quy định pháp luật, công dân sẽ có hành vi vi phạm quyền được pháp luật bảo hộ về tính mạng sức khỏe khi nào?

Cần 4600 kJ để làm bay hơi hoàn toàn 2 kg nước, nhiệt hóa hơi riêng của nước là