单项选择题
What kind of pressure systems travel in easterly waves（）.
A.High pressure
B.Low pressure
C.Subsurface pressure
D.Terrastatic pressure
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相关考题
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What kind of conditions would you observe as the eye of a storm passes over your ship’s position（）.
A.Huge waves approaching from all directions，clearing skies，light winds，and an extremely low barometer
B.Flat calm seas，heavy rain，light winds，and an extremely low barometer
C.Flat calm seas，heavy rain，light winds，and high pressure
D.Huge waves approaching from all directions，clearing skies，light winds，and high pressure -
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What is the first visible indication of the presence of a tropical cyclone or hurricane（）.
A.Stratocumulus clouds or strange birds
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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
