问题
计算题
小刚同学暑假到广西去旅游，当他来到一个峡谷中时，对着峡谷大声呼喊，3s后听到了从峭壁反射来的回声，问峭壁离离小刚多远（当时声音的传播速度是340m／s）？若小刚以2m/s的速度步行前往，则走到峭壁至少需多少时间（假设道路平直）？
答案
510m，255s
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小刚同学暑假到广西去旅游，当他来到一个峡谷中时，对着峡谷大声呼喊，3s后听到了从峭壁反射来的回声，问峭壁离离小刚多远（当时声音的传播速度是340m／s）？若小刚以2m/s的速度步行前往，则走到峭壁至少需多少时间（假设道路平直）？
510m，255s
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| Robert enjoys watching football matches. One day he wanted to 1 quickly. There was a football programme on TV at 7:30. 2 time, he decided to take a shortcut 3 a building site (工地). The wire fence 4 the site wasn't very strong. But 5 his way down, his foot slipped and he fell, 6 on a piece of glass. His wrist was cut and started to bleed (流血) 7 . He took out his 8 and tried 9 it round his wrist as 10 as he could using his teeth. He was not feeling well, but he managed to get 11 the fence onto the road. The blood was still pouring from his 12 . When he got home, his parents weren't back yet. He was tired and a little 13 . He found some 14 and tried t0 15 his wrist. Then he 16 down on the floor, 17 his feet on a chair and 18 his arm in the air. His mother came in and got 19 . "Oh, my God! What happened, Robert? Are you all right?" "I am OK, Mum. 20 the TV set, I want to know the score of the football match!" | ||||
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