单项选择题

A．air traffic problems.
B．safety improvement.
C．the number of flights.
D．flight training courses.
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单项选择题
According to the passage, the working conditions in the new place______.
A．are the same as the speaker is used to.
B．are expected to be rather poor.
C．are just as adequate.
D．are not yet clear.
单项选择题
The oldest documented age for a redwood tree is approximately________.
A．350 years
B．400 years
C．800 years
D．2,000 years
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