Trong phòng thí nghiệm, để nuôi cấy một loại vi khuẩn, người ta sử dụng môi trường nuôi cấy gồm 100g cao nấm men, 6g MgSO₄ và 9g NaCl₂. Đây là kiểu môi trường nuôi cấy:

Chọn đáp án đúng. Cho số dương a. Khi đó?

Tác giả Chu Văn Sơn sinh và mất năm nào?

Khi nghiên cứu về ảnh hưởng của nguồn tài nguyên đến mối quan hệ hỗ trợ giữa các cá thể ở một số quần thể động vật có tập tính khác nhau, kết quả thu được như sau:

Phân tích dữ liệu trên, lựa chọn phương án đúng.

Kết thúc quá trình đường phân, tế bào thu được số phân tử ATP là?

Cho đoạn chương trình sau:

for i in range(6):

          print(i)

Trong đoạn chương trình trên vòng lặp được thực hiện bao nhiêu lần?

Nhận định nào sau đây là không thuộc vai trò của ngân sách nhà nước?

Nhận định nào sau đây đúng khi bàn về vai trò của hoạt động sản xuất?

Read the following passage about studying abroad 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.

Successful students often do the followings while studying. First, they have an overview before reading. Next, they look for important information and pay greater attention to it (which often needs jumping forward or backward to process information). They also relate important points to one another. Also, they activate and use their prior knowledge. When they realize that their understanding is not good, they do not wait to change strategies. Last, they can monitor understanding and take action to correct or “fix up” mistakes in comprehension.

Conversely, students with low academic achievement often demonstrate ineffective study skills. [I] They tend to assume a passive role in learning and rely on others (e.g., teachers, parents) to monitor their studying. [II] For example, low-achieving students often do not monitor their understanding of content; they may not be aware of the purpose of studying; and they show little evidence of looking back or employing “fix-up” strategies to fix understanding problems. [III] Students who struggle with learning new information seem to be unaware that they must extend effort beyond simply reading the content to understand and remember it. [IV] 

Children with learning disabilities do not plan and judge the quality of their studying. Their studying may be disorganized. Students with learning problems face challenges with personal organization as well. They often have difficulty keeping track of materials and assignments, following directions, and completing work on time. Unlike good studiers who employ a variety of study skills in a flexible yet purposeful manner, low-achieving students use a restricted range of study skills. They cannot explain why good study strategies are important for learning; and they tend to use the same, often ineffective study approach for all learning tasks, ignoring task content, structure or difficulty.

Which word below is opposite in meaning to “ineffective”?

Đảo nào có diện tích tự nhiên lớn nhất ở Nhật Bản?

Cho biết kết quả của đoạn chương trình dưới đây?

a = 10

while a < 11:

print(a)

Tại nơi có gia tốc trọng trường g, một con lắc đơn dao động điều hòa với biên độ góc α_0. Biết khối lượng vật nhỏ của con lắc là m, chiều dài dây treo là l, mốc thế năng ở vị trí cân bằng. Cơ năng của con lắc là

Số oxi hóa của nitrogen trong NO₃^- là

Read the following passage about urban shift and mark the letter A, B, C, D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

[I] Sperm whales are fascinating creatures. [II] They possess the biggest brain of any species, six times larger than a human’s, which scientists believe may have evolved to support intelligent, rational behavior. [III] They’re also highly social and capable of making decisions as a group. [IV] But there’s also a lot we don’t know about them, including what they may be saying to one another when communicating with a system of short clicks, known as codas.

Now, new research published in Nature Communications today suggests that sperm whales’ communication is actually much more expressive and complicated than was previously thought. A team of researchers led by Pratyusha Sharma at MIT’s Computer Science and Artificial Intelligence Lab (CSAIL) working with Project CETI, a nonprofit focused on using AI to understand whales, used statistical models to analyze whale codas and managed to identify a structure to their language that’s similar to features of human language. Their findings represent a tool future researchers could use to decipher not just the structure but the actual meaning of whale sounds.

For the study, the researchers examined recordings of 8,719 codas from around 60 whales collected by the Dominica Sperm Whale Project between 2005 and 2018, using a mix of AI algorithms for pattern recognition and classification. The AI then turned the clicks within the coda data into a new kind of data visualization called an exchange plot, revealing that some codas featured extra clicks. These extra clicks, combined with variations in the duration of their calls, appeared in interactions between multiple whales, which they say suggests that codas can carry more information and possess a more complicated internal structure than we had previously believed.

The team’s next step is to build language models of whale calls and to examine how those calls relate to different behaviors. They also plan to work on a more universal system that could be used across species, says Sharma. Taking a communication system we know nothing about, working out how it encodes and transmits information, and slowly beginning to understand what’s being communicated could have many purposes beyond whales. “I think we’re just starting to understand some of these things,” she says. “We’re very much at the beginning, but we are slowly making our way through.”

Which of the following best paraphrases the underlined sentence in paragraph 4?

Kiểu dữ liệu nào sau đây không được đề cập trong chương trình tin học phổ thông?

Xác định một từ/ cụm từ SAI về ngữ pháp hoặc ngữ nghĩa, logic, phong cách.

Qua tác phẩm Tắt đèn cho thấy hình ảnh người phụ nữ nông dân bị áp bức đến cùng cực trong chế độ phong kiến.

Neon (Z=10) tách ta từ không khí là hỗn hợp của hai đồng vị với % về số nguyên tử tường ứng là ²⁰Ne (91%) và ²²Ne (9%). Nguyên tử khối trung bình của Ne là

Read the passage below and choose A, B, C or D.

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.

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.

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.

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.

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.

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

Sự phát triển của các ngành công nghiệp nào sau đây góp phần quyết định việc Trung Quốc chế tạo thành công tàu vũ trụ?