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單項選擇題

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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單項選擇題

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

單項選擇題

The wind is（）and decreasing.

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

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