Ở một loài đậu, tính trạng hạt vàng do gen A quy định là trội hoàn toàn so với tính trạng hạt xanh do gen a quy định. Cho đậu hạt vàng thuần chủng giao phấn với đậu hạt xanh, thu được F₁. Cho các cơ thể F₁ thụ phấn với nhau thu được F₂. Lấy ngẫu nhiên hai cây hạt vàng ở F₂ giao phấn với nhau. Xác định tỷ lệ xuất hiện hạt xanh ở đời F₃.

Đặc điểm nào sau đây không có ở sinh trưởng sơ cấp?

Cho $A=\left[ 1;4 \right],\ B=\left( 2;6 \right)$ và $C=\left( 1;2 \right)$. Xác định $X=A\cap B\cap C.$

Hydrohalic acid nào sau đây không được bảo quản trong lọ thủy tinh?

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

a. Despite the political turmoil in the world today, we can all agree that life isn’t always perfect. 

b. We face hardships to become stronger, recognize our strengths, and appreciate life's beauty. 

c. However, pushing through difficult times is not always easy.

d. Regardless of how much money we make, how many friends we have, or how great our jobs are, everyone experiences ups and downs. Life is life. 

e. Recently, my social media feeds have been overwhelmed with negative and depressing news, particularly regarding politics. 

f. I wonder if you feel the same way; it's hard to escape it. 

Kí hiệu 1s² cho biết

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.

Which of the following best paraphrases this sentence:

“Phones are more than a means of communication - having a mobile phone shows that they are cool and connected.”?

Mệnh đề phủ định của mệnh đề ''$\exists x \in \mathbb{R}: \, 5x-x^2=0$'' là

Cho hình chóp đều \(S . A B C D\) có tất cả các cạnh bằng \(2 a\), điểm \(M\) thuộc cạnh \(S C\) sao cho \(S M=2 M C\). Mặt phẳng \((P)\) chứa \(A M\) và song song với \(B D\). Tính diện tích thiết diện của hình chốp \(S . A B C D\) cắt bởi \((P)\).

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.

DISCOVER THE FUTURE OF LEARNING WITH SMARTLEARN!

Are you ready to learn in a fun and easy way? Try SmartLearn – the app that makes studying (1)________ for everyone! SmartLearn helps students of all ages learn (2)________ and improve their grades. With SmartLearn, you can study anytime, anywhere! The app offers interactive lessons in many subjects like math,  science, English, and history. You can play games, watch videos, and take quizzes to remember what you learn. The lessons (3)________ by teachers are simple and enjoyable. Plus, SmartLearn is safe and family-friendly, so parents can trust it! Download the app today on your phone or tablet (4)________ free. You can try basic lessons or (5)_______ premium access for more features, like personalized study plans and expert tips. Start (6)________ with SmartLearn and see the difference. Don’t wait – get smarter today!

Kế hoạch tài chính cá nhân ngắn hạn thường có thời hạn khoảng bao lâu?

Read the following passage about urbanisation and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions.

URBANISATION: A GROWING PHENOMENON

     Urbanisation is the process through which cities grow, and higher populations begin to inhabit urban areas. This phenomenon has accelerated significantly over the past few decades due to various factors. One of the primary drivers is the search for better employment opportunities. In rural areas, job prospects are often limited to agriculture and small-scale industries, which might not provide sufficient income. Consequently, people migrate to cities seeking better livelihoods and living standards.

     Additionally, urban areas offer more advanced educational facilities and healthcare services compared to rural regions. Many families move to cities to provide their children with higher-quality education and greater future opportunities. Access to hospitals and specialized medical services also attracts people to urban centers, especially in countries where rural healthcare is underdeveloped.

     However, rapid urbanisation brings about several challenges. Overcrowding in cities can lead to inadequate housing, strained infrastructure, and increased pollution. The expansion of urban areas often results in the loss of green spaces and agricultural land, impacting food production and the environment. Governments and city planners must address these issues to ensure sustainable urban growth.

     Despite these challenges, urbanisation has several positive aspects. Cities are often cultural melting pots, where diverse groups of people interact, leading to vibrant communities and innovation. The concentration of resources and talents in urban areas can drive economic growth and technological advancements.

In which paragraph does the writer mention the impact of urbanisation on the environment?

Trào lưu Triết học Ánh sáng là ngọn cờ tư tưởng của giai cấp tư sản ở quốc gia nào sau đây?

Tập $A=\left\{ 1;2;3;4;5;6 \right\}$ có bao nhiêu tập hợp con có đúng hai phần tử?

Một điện tích q bay vào trong một điện trường đều theo phương vuông góc với đường sức điện. Trong suốt quá trình chuyển động, thế năng điện của điện tích đó

Phủ định của mệnh đề "$n > 9$" là

Đối tượng nào được dùng để định dạng, tính toán, tổng hợp và in dữ liệu?

Nhà sinh vật học nằm trong nhóm ngành nào?

Thần Ê-pi-mê-tê đã làm gì để tạo ra loài người?