单项选择题

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

A．$9.
B．$18.
C．$12.
D．$36.

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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

To resolve remaining uncertainties, it’s necessary to observe factors such as wind, clouds, and humidity in the troposphere to make sure they are consistent with ______.

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