单项选择题


Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．They were able to fly it in the air.
B．They were able to stay up in the air for half an hour and more in the machine.
C．They were able to carry travelers.
D．They were able to fly in around Dayton.
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单项选择题
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.
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.
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.
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