46. Scientists have known ______ the moon is.

　　A. how long B. how heavy C. how old D. how big

　　47. The earth is about 384, 000 kilometres away from the ______.

　　A. space B. universe C. sun D. moon

　　48. A plane cannot fly to the moon because ______.

　　A. there is no air above 240 kilometres away from the earth

　　B. there is no gas in the plane

　　C. the plane is not strong enough

　　D. the plane must be driven by a man

　　49. The hot gas in the rocket is used for ______.

　　A. keeping the air in the rocket fresh（新鲜的）

　　B. keeping the men in the rocket warm

　　C. making the rocket fly up

　　D. cooking food for the men

　　50. Several rockets without men in them have flown to ______.

　　A. the stars B. the satellites of the sun

　　C. the sun D. another satellite of the sun

　　(B)

　　Tom didn't live too far from school. So he went there and back on foot every day. On his way to school he passed（路过）a wet playground when it rained. One day the boy came home very wet. His mother became angry and said, Don't play in the water on your way home or to school.The next day he came home very wet again. His mother became even angrier. I'll tell

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