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huynhngocbaotran2504
2 năm trước
một ô tô chuyển động đều với vận tốc 60km/h đuổi theo 1 xe khách đang chạy vs vận tốc 40km/h cách đó 50km. Hỏi sau bao lâu thì ô tô đuổi kịp xe khách
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Choose the best answer. 1. Vietnamese people are very _________________ and hospitable. A. reserved B. friendly C. official D. quiet 2. We can learn how ______ banh chung at Tet. A. To make B. Made C. Making D. Make 3. Ho Chi Minh City has been divided into twenty-four ___________ divisions since December 2003. A. Administrative B. Administration C. Administrator D. Administer 4. Public suggest that the factories_____________ with waste treatment system. A. Should equip B. Would be equiped C. Equiped D. Would equip 5. Nam didn’t know…………….to find more information the course. A. What B. Where C. why D. while 6. The farmers in my home village ______ rice home on trucks. They used buffalo-driven carts. A. didn’t used to transport B. Didn’t used transport C. didn’t use to transport D. used to transport 7. The Imperial Citadel of Thang Long is a _______ that consists of royal palaces and monuments. A. Structure B. Fortress C. Complex D. limestone 8. At night they used to entertain ______ by telling and acting out stories. A. Themselves B. Them C. Their D. Themself 9. It ………………….that They are quieter and cheaper than taxi. A. said B. Are said C. Is said D. Say 10. The children in my home village used to go _____, even in winter. Now they all have shoes. A. Bare-footed B. Played around C. Playing around D. On foot 11. Mary asked me Where I…………………from A. Coming B. come C. To come D. came 12. I wish people in the world ______ conflicts and lived in peace. A. Don’t have B. Didn’t have C. Didn’t had D. Doesn’t have 13. In Viet Nam, ______ often refers to age and social position, not to wealth. A. Culture B. Seniority C. Generation D. Tradition 14. Tom ‘’Thanks for the nice gift’ Daisy A. I am glad you like it B. You are welcome C. I myself don’t like it D. I’m happy 15. A ______ is used to make the sound much louder so that many people can hear it from a distance. A. Radio B. Computer C. Loudspeaker D. Television 16. Traditional craft has …………………….from generation to generation A. Passed B. passed down C. pass D. Been passed down 17. My mother doesn’t work ………………….. Saturday A. On B. in C. At D. for 18. It is ……………Ha long bay was recognized as a word Heritage site by UNESCO A. Knew B. To know C. known D. knowing II . Choose the word whose underline part is pronounced differently from the others. 19. A. measure B. conduct C. stuck D. frustrated 20. A. impolite B. night C. tradition D. slight III . Choose a word in each line that has different stress pattern. 21. A. people B. enough C. picture D. father 22. A. depend B. begin C. agree D. happen IV. Read the passage, and choose the best answer. Good manners are a treasure to the people who possess them, as well as to the community they live in. Manners are taught, learnt, and passed from generation to generation. Even hundreds of years ago, children were taught to behave responsibly. They learnt to respect seniority. When they passed an object to another person, they had to use both hands. When they entered a room, they had to bow and greet the oldest person first. Boys learnt to work hard to support their families. Girls learnt to do housework, and to take care of others. Loyalty and honesty were highly appreciated. When they made a mistake, they would not let another person be punished for it. That would be cowardly and mean. They were taught that families were strong, and everybody should stick together in adversity.(tai họa, nghịch cảnh) Fortunately, many of these values have been well preserved. They have contributed to making the unique Vietnamese culture, and strengthening our society. 23. Good manners are _______________________. A. of great value B. of the community C. traditional D. only for the old 24. What was a boy’s main duty? A. to respect seniority B. to support his family C. to do housework D. to share good things 25. The sentence: “When they made a mistake, they would not let another person be punished for it,” means they would _______________________. A. deny their mistake B. admit their mistake C. keep it a secret D. be punished 26. What contributed to making the unique Vietnamese culture? A. tradition B. generations C. good manners D. seniority 27. This passage is about_______________________. A. people who possess good manners B. what bad manners children in the past had C. the preservation of bad values D. good manners and their value

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