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1.我国发射的一颗绕月运行的探月卫星“嫦娥1号”。设该卫星的轨道是圆形的,且贴近月球表面。已知月球的质量约为地球质量的,月球的半径约为地球半径的,地球上的第一宇宙速度约为7.9 km/s,则该探月卫星绕月运行的速率约为

A.0.4 km/s     B.1.8 km/s     C.11 km/s     D.36 km/s

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199. Did you get much _____ from your holiday?

  A. honour        B. benefit               C. reward               D. prize

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198. To ask someone for help is to turn _____ him.

  A. to            B. for              C. on              D. by

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197. Smoking is not _____ in the meeting hall.

  A. supposed       B. allowed           C. happened          D. admitted

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196. --- At last day _____ and it began to get light.

   --- It’s time for you to leave.

  A. lighted         B. broke            C. rose             D. began

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195. Her husband felt it would be silly to _____ the colour of the curtains before they had painted the room.

  A. change         B. find              C. choose               D. lose

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194. He spoke so quickly that I didn’t _____ what he said.

  A. receive        B. accept            C. take             D. catch

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193. Every time he tried to start the car, the wheels _____ deeper into the mud.

  A. stayed         B. sank             C. fell              D. dropped

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192. As the storm drew near, black clouds were _____ over the sky.

  A. smoothing      B. wandering         C. running           D. gathering

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191. It’s no _____ arguing about it, because he will never change his mind.

  A. time          B. while            C. use              D. help

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