单项选择题

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

A．At two o’clock.
B．At three o’clock.
C．At four o’clock.
D．At five o’clock.
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单项选择题
A．At low latitudes.B．At mid-latitudes.C．At high latitudes.D．At high altitudes.
A．At low latitudes.
B．At mid-latitudes.
C．At high latitudes.
D．At high altitudes.
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