单项选择题

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

A．He does not have a good hearing.
B．He has been driving madly for a year.
C．He never takes what she says seriously.
D．He is always impatient with her.
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单项选择题
How far water drops to the turbines in a power station is known as ______ .
A．the heads
B．the flow rate
C．the vertical distance
D．the heights
单项选择题
A drawback to low head hydroelectric power stations is that they depend on ______ .
A．the solar activity
B．seasonal water flow
C．seasonal wind direction
D．the earth’s self rotation
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