问题描述：
The moon and the stories about it have always_people.In ancient times,people imagined p
it to be a sort of"paradise"for living being.Since 1969,a number of_have been sent to the moon.Scientists have so far found no_of life.But we have got more knowledge about the moon.As the only satellite of Earth,it is much smaller and is only 3479 km in_.Man doesn't walk on the mon but"floats"above it,because the moon has extremely low_,only about 1/6 that of Earth.This gravitational field is insuffi-cient to gases.So the moon lacks an atmosphere and is completely_for human beings.
it to be a sort of"paradise"for living being.Since 1969,a number of_have been sent to the moon.Scientists have so far found no_of life.But we have got more knowledge about the moon.As the only satellite of Earth,it is much smaller and is only 3479 km in_.Man doesn't walk on the mon but"floats"above it,because the moon has extremely low_,only about 1/6 that of Earth.This gravitational field is insuffi-cient to gases.So the moon lacks an atmosphere and is completely_for human beings.
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