单项选择题

Two well-developed high pressure areas may be separated by a（）.

A.Hill of low pressure
B.Trough of low pressure
C.Valley of low pressure
D.Ridge of low pressure

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单项选择题
Tropical cyclones are classified by form and intensity.Which system does not have closed isobars（）.

A.Hurricane
B.Tropical disturbance
C.Tropical depression
D.Cyclone
单项选择题
The wind is（）and decreasing.

A.anticlockwise rotating
B.anticlock rotating
C.clockwise rotating
D.clock rotating
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