Hiện tượng xảy ra khi cho dây sắt nóng đỏ vào bình đựng khí clo: A. có khói trắng. B.có khói nâu. C. có khói đen. D. có khói tím.
These days, it is impossible to open a newspaper without reading about the damage we are doing to the environment. The Earth is being threatened and the future looks bad. (1)______ can each of us do? We cannot clean (2)______ our polluted rivers and seas overnight. Nor can we stop the (3)______ of plants and animals. But we can stop adding the problem while scientists look for the answers. It may not be easy to change your lifestyle completely. But some steps are easy to take: cut down the amount of driving you do, or use as little plastic as possible. It is also easy to save (4)______, which also reduces household bills. We must all (5)______ personal decision to work for the future of our planet if we want to ensure a better world for our grandchildren. 1. A. When B. Where C. What D. Why 2. A. to B. in C. on D. up 3. A. appear B. disappear C. appearance D. disappearance 4. A. water B. energy C. money D. health 5. A. make B. do C. take D. have
Cho tam giác ABC, các trung tuyến AD, BE, CF, cắt nhau tại G. Tính AE/AC Tính AG/GD Tính FG/FC Các bạn ơi giúp mình với
II Write the past form of the following verbs. 1. write 9. meet 2. see 10. tell 3. make 11. put 4. buy 12. speak 5. ride 13. know 6. wear 14. cut 7. hear 15. read 8. begin 16. go III. Put the following verbs into the past tense. 1. Alan (not see) ........................ Paul at school. 2. Carol (bring) ........................ her new laptop to school. 3. The baby (cry) ........................ all night long. 4. My brother (can) ........................ swim when he (be) ........................ four. 5. Charles (prepare) ........................ a nice dinner. 6. The children (eat) ........................ cheese sandwich. 7 you (sit) ........................ next to Mary? 8. There (be) ........................ a lot of people at the match. 9. Peter (forget) ........................ my birthday. 10. The children (play) ........................ football after school.
Cho hình thang ABCD có AB = 12 cm, CD = 18 cm. Kẻ đường cao AH. Biết diện tích tam giác ADC là 72 cm2. Tính diện tích hình thang ABCD.
Một cái máy khi hoạt động với công suất 1500 W thì nâng được một vật nặng 60 kg lên độ cao 12 m trong 30 s. a. Tính công mà máy đã thực hiện trong thời gian nâng vật. b. Tính hiệu suất của máy trong quá trình làm việc.
Giúp mình giải mấy bài này vs ạ
11. Thanks ………. . your letter. 12. I’ll see my mom and dad ……………. . their farm. 13. We have to work hard ………. home and……………. school 14. We’ll visit her ………. Christmas. 15. Are you tired …………. . watching TV? 16. She often brings them …………… school. 17. He works ………. a factory. 18. We always go to Ha Long Bay ………. vacation. 19. Tell me more ………. . your family. 20. Can you send me a photo ………. . your family? 21. He goes ………. the city …………his wife. 22. It takes 18 hours to get ………Hanoi ………. coach. 23. We write ………. each other twice a week. 24. He is the president …………………. our club. 25. She spends most ……………the time …………. the couch ………. front ……. the TV. 26. What do you usually do …………. school? 27. Why don’t you come …………. .? 28. They swap cards ………. their friends. 29. Will you play a game ……………. . catch? 30. What do you do ……………. . recess? 31. They usually have portable CD player ……………. small earphones. 32. I’ll take part……………. your club. 33. They read or study …………. the same time. 34. We enjoy all ………………… our classes. 35. …………. school we study many things. 36. …………. . history, we study past and present events………. . Vietnam and ………the world. 37. …………. . physics, we learn …………how things work. 38. She learns how to use a computer ………. . her Computer Science class. 39. Newspapers are ………. the racks ……………. the middle. 40. Math books are ……………. . the shelves ………. . the left. 41. The largest library is ………………Washington D. C, the capital ………. the USA. 42. Those books ………. the back …………the libraries are ………English. 43. Now, come and look ……………the kitchen. 44. My uncle is …………. . work now. 45. Can I see the rest ………the house? 46. She’ll have a party ………. . her birthday.
Nếu bạn An đi lên một thang cuốn tốc độ là 1 bước trên giây thì bạn An sẽ đến đỉnh thang trong 10 bước. Nếu bạn An tăng vận tốc lên 2 bước trên giây thì sẽ lên tới đỉnh thang trong 16 bước. Hỏi thang cuốn có bao nhiêu bước?
Mí bạn ơi😄😄bạn nào đang ở nhà thì chụp giúp mình bt 5,6,7,8,9 / sgk trang 11 , 12 (toán đại lớp 7 tập 2 )😉😉 Mí bạn chụp giúp mình rõ xíu nhe😅😅
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