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
199. Did you get much _____ from your holiday?
A. honour B. benefit C. reward D. prize
198. To ask someone for help is to turn _____ him.
A. to B. for C. on D. by
197. Smoking is not _____ in the meeting hall.
A. supposed B. allowed C. happened D. admitted
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
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
194. He spoke so quickly that I didn’t _____ what he said.
A. receive B. accept C. take D. catch
193. Every time he tried to start the car, the wheels _____ deeper into the mud.
A. stayed B. sank C. fell D. dropped
192. As the storm drew near, black clouds were _____ over the sky.
A. smoothing B. wandering C. running D. gathering
191. It’s no _____ arguing about it, because he will never change his mind.
A. time B. while C. use D. help