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trinhhienmn123
2 năm trước
một viên đạn đang bay thẳng đứng lên cao với vận tốc 100m/s thì nổ thành 2 manh. mãnh lớn có khối lượng 20g bay ngang với vận tốc 200m/s bỏ qua khối lượng thuốc nổi của đạn. độ lớn vận tốc của manh nhỏ là
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Read the following passage and fill each numbered blank with ONE suitable word: The tradition of birthday parties started a long time ago. People thought that there (1) ______a special danger from evil spirits, so friends and family came together to bring good thoughts and wishes and even presents. At one time, only kings had birthday parties but as time went (2) ______, children and then adults began to have their (3) ______birthday celebrations. There are some traditions (4)______as sending birthday cards, blowing out the candles on a birthday cake and singing the “Happy Birthday”song, that you can easily find (5) ______anywhere, any time.In China, everyone celebrates their birthday on New Year’s Day: they become one year (6) ______on that day. On a child’s second birthday, family members (7) ______ a variety of objects on the floor around the child. According to Chinese tradition, the first object that the child picks up tells you what profession the child will choose (8) ______in life.In many English speaking countries, a twenty-first birthday cake often has a key on top, or the cake (9) ______is sometimes in the shape of a key. The key means that the young person is now old enough to leave and enter the family home at (10) ______time they want to.

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