水是由氢和氧按1：8的质量比化合而成的，氧的质量占水的质量的（）。

The earth moves round the sun, and the moon moves round the earth. When our part of the earth turns__46__ the sun, it is day. When our part of the earth runs away __47__ the sun, it is __48__.
The sun is much __49__ than the moon. But sometimes the moon _50__ bigger than the sun, because it’s much __51_ to the earth.
The sun is very bright. It gives very __52__light. The moon looks quite bright, too, but it doesn’t give any light at all. The light __53_ the moon comes from the sun.
The moon looks much bigger and brighter than the stars, _54__ in fact the stars are much bigger and brighter than the moon. __55__ smaller than the moon because they are farther away from the earth.

小题1:	A．to B．from C．around D．on

小题2:	A．from B．to C．off D．at

小题3:	A．day B．noon C．night D．evening

小题4:	A．small B．big C．smaller D．bigger

小题5:	A．look B．looks C．sees D．watches

小题6:	A．near B．far C．nearer D．farther

小题7:	A．stronger B．poor C．weak D．strong

小题8:	A．from B．of C．to D．away

小题9:	A．and B．so C．but D．because

小题10:

A．It look B．They look C．They looks D．It look