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单选题

A．Earth and the Moon traveled at different speeds.
B．The Moon formed billions of years before Earth.
C．Earth did not have enough gravitational pull.
D．Earth and the Moon were too far from each other.

参考答案C

解析:According to the Prof., why do scientists disagree with the theory that earth captured the moon?
细节题。根据But study shows that the young earth would not have had enough gravitational force to stop a body the size of a moon from traveling through the solar system and pull it into orbit．可知．年轻的地球没有足够的引力去阻止月球穿过太阳系，把它拉进轨道。因此，正确答案为C。

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单选题

A．The Moon has no water.
B．The Moon' s materials came from Earth' s core.
C．The Moon's core differs from its surface.
D．The Moon contains little iron.

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单选题

A．It is difficult to define.
B．Its causes are often unknown.
C．Psychologists disagree about how to treat it.
D．Its symptoms often go unnoticed.

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单选题

A．To explain the effect it has on mental illness.
B．To suggest that it is easier to diagnose than mental illness.
C．To discuss the role of medicine in clinical psychology.
D．To show the similarities between physical and mental illness.

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