单项选择题
What is the first visible indication of the presence of a tropical cyclone or hurricane（）.
A.Stratocumulus clouds or strange birds
B.Rain and increasing winds
C.An exceptionally long swell
D.Dark clouds and the“bar”of the storm
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相关考题
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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 -
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
