单项选择题

A．Because the moon’s composition is different from Earth’s composition.
B．Because the moon has almost no iron.
C．Because the moon and the Earth are of similar composition.
D．Because the Earth’s gravitational force is net strong enough.
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单项选择题
A．Rome.B．Italy.C．Spare.D．Central Aha.
A．Rome.
B．Italy.
C．Spare.
D．Central Aha.
单项选择题
A．He has covered about 900 miles.B．He sometimes skips breakfast.C．It is hard for him to cover over 50 miles a day.D．Missouri is a place which has impressed him most
A．He has covered about 900 miles.
B．He sometimes skips breakfast.
C．It is hard for him to cover over 50 miles a day.
D．Missouri is a place which has impressed him most
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