: Cho tia tới SI chiếu đến 1 gương phẳng với S là điểm sáng và I là điểm tới như hình vẽ: a) Vẽ ảnh S’ của điểm sáng S b) Vẽ tia phản xạ IR c) Biết góc tới i = 500. Tính góc tạo bởi tia tới SI và tia phản xạ IR

Viết công thức cấu tạo thu gọn có thể có của các hợp chất sau: (chỉ viết mạch cacbon không nhánh và mạch cacbon có nhánh) A. C3H8 B. C3H7Cl C. C2H4O

Tại sao phải đặt vấn đề bảo vệ rừng A-ma-dôn?

Giúp mk câu 3 với nhanh nhé cần gấp

help meeeeeeeeeeeeeeeeeeeeeeeeeeeee

nêu vai trò của hình biểu diễn trong bản vẽ lắp

Một hình chữ nhật có chiều dài 4/5 m chiều rộng chiều rộng bằng 3/4 chiều dài. Tính chu vi và diện tích hình chữ nhật đó.

Mọi người giải giúp mình bài 2 và 3 nha mình cảm ơn

Read the passage and then decide whether the statements that follow are True or False (1.0pt) People pollute the environment by throwing litter or garbage all over the places every day. They also dump empty bottles or cans into the rivers, lakes and seas, making the water unclean. They also cut a lot of trees to get wood pulp for making paper. To protect the environment, everyone should classify and put the garbage in a certain bag for making compost and they should recycle waste paper to avoid cutting a lot of trees. We can protect the environment by doing like that. We also should plant more and more green trees because trees help to hold the soil, prevent us from floods and give us fresh air and shade in summer. 27. In order to get fresh air we should cut down all the trees. 28. People should protect the environment to have good health. 29. We ought to give up everything when we don’t use it anywhere. 30. People make the environment unpolluted. Read passage again and choose the best answer (A, B, C or D) (0.5pt) 31. “classify” in the third line means: A. thrown away B. put something orderly C. bring D. send

GIẢI GIÚP MÌNH VỚI Ạ Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. Question 1: A. global B. gather C. gambling D. insert Question 2: A. apologize B.application C. musician D. minority Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. Question 3: A. jumped B. loved C. washed D. liked Question 4: A. passage B. storage C. message D. teenage Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 5: : If you had taken my advice, you _______ in such difficulties. A. won't be B. hadn't been C. wouldn't be D. wouldn't have been Question 6: How long ago ______ to learn French? A. have you started B. were you starting C. would you start D. did you start Question 7: Paul didn’t mind _______by his fortieth birthday party held by his friends. A. surprising B. being surprised C. to surprise D. to be surprised Question 8: ______charge for ______excess luggage is £10 ________kilo. A. The/ an/ a B. The/ Ø/ a C. Ø/ Ø/ a D. Ø/ an/ the Question 9: Your father is very kind ________David. A. to B. with C. for D. of Question 10: ______with her boyfriend yesterday, she doesn’t want to answer his phone call. A. Because of she quarreled B. Had quarreled C. Because of having quarreled D. Having been quarreled Question 11: Marie Curie, ________, was awarded a Nobel Prize for her work. A. the scientist discovered radium B. the scientist who discovered radium C. whose scientific discovery of radium D. was the scientist who discovered radium Question 12: _______the United States consists of many different immigrant groups, many sociologists believe there is a distinct national character. A. Even though B. Despite C. Whether D. In spite of Question 13: Excuse me. Where is the _______office of OXFARM located ? A.head B. leading C. central D. summit Question 14: The suspect confessed _______. A. the police his crime B.his crime C. his crime the police D. his crime to the police Question 15:Would it be possible to make an early _______to have my car serviced tomorrow? A. appoint B. appointing C. appointment D. appointed Question 16: I’d like to _______this old car for a new model but I can’t afford it. A. convert B. replace C. exchange D. interchange Question 17: I really regret ______ your feeling when I asked you such a silly question. A. hurt B. to hurt C. hurting D. hurts Question 18: The information in this article is _______inaccurate. A. historic B. historical C. history D. historically Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions Question 19: She was dumbfounded at this magical event, and stood there open mouthed for long time, looking at this strange object in her own hand. A. speechless B. astonished C. content D. applauding Question 20: The company paid its workers undeservedly, which made them let down. A. emotional B. optimistic C. disappointed D. satisfied Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions Question 21: People sometimes choose partners who compensate for their own shortcomings. A. benefits B. strengths C. flaws D. disadvantages Question 22: I was under the impression that I would listen to all the additional questions first and then respond to them all in one go. A. didn’t believe B. didn’t report C. didn’t declare D. didn’t support