user-avatar
1169342986772879
2 năm trước
Một thấu kính hội tụ có tiêu cự 20cm. Vật sáng AB là một đoạn thẳng đặt vuông góc trục chính của thấu kính cho ảnh cao bằng vật. Xác định vị trí vật và ảnh..
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

21. Which __________ is Britain in? – Europe. A. country B. continent C. city D. area 22. People must be well-prepared ________ they want to climb Mount Everest. A. after B. until C. although D. before 23. International school in Ho Chi Minh City is the __________ school in Vietnam with high-tech facilities. A. oldest B. youngest C. most historic D. most modern 24. Our team couldn’t win the championship, _______their good preparations. A. so B. in spite of C. because D. although 25. ___________ is a marathon in miles? ~ About 26 miles. A. How often B. How many C. How long D. How wide 26. ‘Can you give me the remote control on the table?’ ‘___________ Don’t you like this program?’ A. Never mind. B.You’re welcome. C. Certainly. D. Really? 27. ________ up the tree! You’ll fall down. A. Climb B. Climbing C. Not to climb D. Don’t climb 28. Minh goes to the karate club three times a week. A. Where does Minh go to the karate club? B. What does Minh go to the karate club? C. How often does Minh go to the karate club? D. How often Minh goes to the karate club? 29. Pele scored 1,281 goals in his 22-year career. A. How did Pele score goals his 22-year career? B. How much goals did Pele score s his 22-year career? C. How many goals did Pele score his 22-year career? D. How many goals Pele scored goals his 22-year career? 30. We have lived in New York for ten years. A. How long have you lived in New York? B. How long you have lived in New York? C. When have you lived in New York? D. How long did you live in New York? V. Rewrite these sentences 31. What was your favourite subject at school? A. What did you like at school? B. What subject did you like best at school? C. What subject did you enjoy best at school? D. What was your favour at school? 32. I haven’t visited my family since 2005. A. I didn’t visit my family in 2005 B. The last time I visited my family was in 2005. C. My family hasn’t visited me since 2005. D. My family didn’t visit me in 2005. 33. My parents moved to New Zealand in 2010. A. My parents have lived in New Zealand since 2010. B. My parents lived in New Zealand since 2010. C. My parents have lived in New Zealand in 2010. D. My parents have already lived in New Zealand in 2010. 34. I think that no city in the world is more beautiful than Paris. (most) A. I think that city is more beautiful than Paris. B. I think that more beautiful city than Paris. C. I think the most beautiful city in the world is Paris. D. I think no the most beautiful city in the world is Paris. 35. I/ not play/ badminton/ last Sunday/ because/ I/ be/ ill. A. I didn’t play badminton last Sunday because I am ill. B. I not play badminton last Sunday because I was ill. C. I was not play badminton last Sunday because I was ill. D. I didn’t play badminton last Sunday because I was ill. VI. Read the text then choose the best answer for each questin: REBECCA STEVENS Rebecca Stevens was the first woman to climb Mount Everest. Before she went up the highest mountain in the world, she was a journalist and lived in South London. In 1993, Rebecca left her job and her family and travelled to Asia with some other climbers. She found that life on Everest is very difficult. “You must carry everything on your back,” she explained, “so you can only take things that you will need. You can’t wash on the mountain, and in the end I didn’t even take a toothbrush. I am usually a clean person but there is no water, only snow. Water is very heavy so you only take enough to drink!” Rebecca became famous when she reached the top of Mount Everest on May 17, 1993. After that, she wrote a book about the trip and people often asked her to talk about it. She got a new job too, on a science program on television. . 36. Where was Rebecca Stevens from? A. England B. Asia C. Everest D. The South 37. Before she climbed Everest, Rebecca Stevens was a ___________. A. climber B. journalist C. traveler D. scientist 38. Why did Rebecca Stevens become famous? A. She left her job and her family and travelled to Asia. B. She found that life on Everest is very difficult. C. She reached the top of Mount Everest in 1993. D. She was the first woman to climb Mount Everest. 39.Life on Everest is very difficult because ___________. A. it is very high B. you can’t take things with you C. there is no water there D. there are no toothbrushes 40. After 1993, Rebecca had a ___________. A. new book B. new job C. program D. television

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team