单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．They bought the motorbike.
B．They had no timer
C．They didn’t want a refrigerator.
D．There’s nothing wrong with the old one.
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单项选择题
A．It plans to send a probe to explore the moon.B．It’s NASA’s most expensive project so far.C．It’s an ambitious project.D．It’s involved in the construction of the American space station.
A．It plans to send a probe to explore the moon.
B．It’s NASA’s most expensive project so far.
C．It’s an ambitious project.
D．It’s involved in the construction of the American space station.
填空题
Water vapor plays almost no role in modern greenhouse warming.
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