Hai xe máy khởi hành cùng một lúc từ A đến B . Xe máy thứ nhất có vận tốc trung bình lớn vận tốc trung bình của xe máy thứ hai 10km/h, nên đến trước xe máy thứ hai 1h. Tính vận tốc trung bình của mỗi xe máy, biết rằng quãng đường AB dài 120 km

B=636363x37-3737373x63 tính vote 5 sao và đánh giá hay nhất

Tại sao cá cóc tam đảo có tên gọi là cá nhưng không đc sếp vào lớp cá mà lại đc sếp vào lớp lưỡng cư

Aids là gì? Nguyên nhân dẫn đến AIDS và những con đường lây nhiễm HIV-AIDS?

Chia sẻ về một cuốn sách mà em yêu thích. Hoặc một cuốn sách đã làm em thay đổi nhận thức hoặc cuộc sống của em

Giúp mình với nhé mk đg cần gấp

ae giải giúp tôi với................

Nguyễn Ái Quốc sinh ra và lớn lên trong gia đình như thế nào

Mn giúp đỡ vs ạ . xin cảm ơn ヾ(・ω・)メ(・ω・)ノ

8. This is the most interesting novel ……………..A. I’ve read /B. I read /C. I had read / D. I am reading 9.My father………….. Kuala Lumpur three times. A. has visited /B. will visit/ C. visited/ D. have visited 10.The noise in the street usually……………. me awake at night. A. keeps/ B. is keeping/ C. kept/ D. has kept 11.……… to a native speaker of English, Phong? A.Have you ever talked B. Did you ever talk C. Do you ever talk D. Are you ever talking 12.We sometimes …………… out when we lived in the city. A. eat/ B. will eat/ C. have eaten/ D. ate 13.Vinh……… home for school yet. A. did not eaten/B. hasn’t left/C. isn’t leaving/ D. don’t leave 14.Amsterdam is one of the……………. cities in the world. A. peaceful/ B. peacefuller/ C. most peaceful/ D. more peaceful 15.There are two kinds of sports: ……………… sports and individual sports. A. private/B. team/ C. group/ D. water 16.………………………….. do you think you can live without TV? A. How many/B. How often/ C. Which / D. How long 17.People in Tokyo are very polite …………… friendly. A. or / B. and / C. but / D. so 18I don’t like that film ……………………. it was too boring. A. and / B. so/ C. because/ D. but 19. He …………………… London two years ago and I ……………………….. him since then. left/ hadn’t seen B. left/ haven’t seen C. left/ didn’t seen D. was living/ haven’t seen 20. When we were in Stockholm, we had coffee……... a coffee shop ………… the Old Town. A. on/ on/B. in/ in/C. on/ in/D. at/ at 21. She is ………………. in my class. A. the most best/ B. the best/ C. best/ D. the goodest 22. I haven’t met him since he ………………….. school. A. left/ B. was leaving/ C. had left/ D. was left 23. I………………… her since I …………… a student. A. know/ am /B. knew/ was /C. have known/ was/D.have known/ were 24. My sister usually …………………… the bus to school. A. takes/ B. took/ C. take/ D. taken 25. ………………. the film is late, I will wait to watch it. A. Because/ B. Although/ C. When /D. But 26. My favorite ……………… is swimming. A. game/ B. match/ C. activity/ D. sport 27. It doesn’t rain so I …………………. the flowers in my garden everyday. A. watered/B. water/ C. watering/ D. waters 28. – “ ........................ a nice T- shirt, Trang!” – Thank you. ” A. How/ B. What / C. Which / D. It 29. I first ......................... Melbourne in 2003. A. went / B. have been/ C. have gone/ D. visited 30. My brother can’t swim ....................... he’s afraid of water. A. because/ B. but/ C. and/ D. so 31. ........................ eat too much salt. It’s not good for you. A. Do/ B. Don’t/ C. Please/ D. Can’t 32. My sister ............................ never gone abroad before. A. was/ B. has/ C. have/ D. Had 33.If we use ............................ bags,we will help the environment . A.new/ B. Cheap/ C. Reusable/ D.reduced. 34.Why do you often forget to ...................... the lights before going out ? A. turn on/ B. turn off / C. close / D. shut down. 35.Robots can.............our houses when we are away. A. see/ B. guard/ C. look at / D. look. 36.”.................... do you think about new kinds of robots?” A. How/ B. What/ C. Why/ D. When. 37..................... you know about how to recycle glass ? A. Do/ B. Can/ C. What/ D. Why.