单项选择题

A.Hill of low pressureB.Trough of low pressureC.Valley ……

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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A.Hurricane
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A.anticlockwise rotating
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A.To stay
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A.Southeast
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A.Thermometer
B.Hygrometer
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