单项选择题


Questions 19 to 22 are bused on the conversation you have just heard.

A．She generally doesn’t allow people to borrow it.
B．She bought it from a friend.
C．She is trying to sell it.
D．It has broken down before.
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单项选择题
A．The possible existence of life on other planets.B．A technical problem that astronomers can’t solve.C．Methods for building powerful new telescopes.D．The discovery of planets orbiting distant stars.
A．The possible existence of life on other planets.
B．A technical problem that astronomers can’t solve.
C．Methods for building powerful new telescopes.
D．The discovery of planets orbiting distant stars.
填空题
Some researchers have discovered that chimpanzees have a hallmark of human culture.
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