Suy nghĩ của em về tác động của khoa học kĩ thuật đối với cuộc sống và môi trường. Trách nhiệm của bản thân. Giống viết văn nha mn! Làm ơn giúp mình.

Biến đổi khí hậu có tác động tiêu cực như thế nào đến sản xuất nông nghiệp ở nước ta ?

Cho tình huống: Mẹ Khánh mua hàng, hỏi người bán hàng: 

- Hàng này có tốt không anh?

- Mốt mới đấy! Mua đi! Dùng rồi sẽ biết bác ạ!

? Câu trả lời của người bán hàng đã vi phạm phương châm hội thoại nào?

You are Minh. This is part of a letter your eceive from an English friend, Carla:         " We are doing a project at school about breakfast around the world. Please tell me about breakfast in your country. What do you eat for breakfast? Do People eat different things? "

1. Experts think that all the dogs evolved from wolves.  (THOUGHT)
⇒All the dogs are_____________________________evolved from wolves.
2. Immediately after his arrival things went wrong. (THAN)
⇒No sooner__________________________________things went wrong.
3. No one respects him because of his rude behavior. (LOOKS)
⇒Every one___________________________because of his rude behavior.
4. This is Maryam’s second visit to this museum.   (VISITED)
⇒ This is the second time ___________________________ this museum.     

5. The House Construction Company is building the Greenhouses.  (BEING)

⇒The Green houses ______________________________by the House Construction Company.  

I. Choose the best word or phrase to complete each sentence. Write your answer A, B, C or D in the numbered box (10 points)

1. Randolph ………… at the door and saw a shadow move across the floor.

 A. glimpsed           B. glanced                 C. observed                D.  looked

2.Although he tried to hide it , it was ………that Peter didn’t like his birthday present.

  A. foolish                    B. vigorous                   C. basic                 D. obvious

3. He dislikes ……………… what to do.

  A. people tell him          B. to be told         C. being told      D. they telling him

4. The scientist said the Earth…………………the Sun ?

   A. goes around        B. is going around        C. had  gone around       D. was going around

5. If you can give me one good reason for your acting like this, ………….this incident again.

            A. will I never mention                     B. I will never mention    

            C.I don’t mention                             D. I never mention

6. We came within sight of Everest,……………..has attracted so many climbers.

        A. the summit of which                                         C. which the summit 

        B. whose summit of                                              D. of which the summit

7. ……………excellent art museums, Moscow has a world-famous ballet company.

  A. Because of        B. In spite of            C. In case of               D. In addition to

8. Lan : What you did was desirable !

    Ha : ………………………………..

A. Well done!   B. It doesn’t matter  C. You’re welcome   D. You did so well,too.

9. Good citizens always abide…………the law.

        A. to                       B. by                      C. with                            D. for

10. ……………….to support the case against James?

      A. Is there any proof                                      C. Are there any proof   

      B. Is there any proofs                                    D. Are there any proofs

\(n^2-n=\left(n-1\right)n⋮2\)

Vậy \(n^2-n\) chia hết cho 2

Chứng minh rằng: với ∀ số tự nhiên n ta có:  B= \(4^{n+1}+60^n-4⋮36\)