单项选择题

A． They have different opinions about life.
B． They have different opinions about humor.
C． They have different moral principles.
D． They have different ways of expressing folk wisdom.
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单项选择题
A． They are trying to find another planet for human beings to live on.B． They are looking for fossils on Mars.C． They are sending robots to Mars.D． They are digging underground the Mars.
A． They are trying to find another planet for human beings to live on.
B． They are looking for fossils on Mars.
C． They are sending robots to Mars.
D． They are digging underground the Mars.
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