单项选择题
An anemometer on a moving vessel measures（）.
A.apparent wind speed only
B.true wind speed and true wind direction
C.true wind speed only
D.apparent wind speed and true wind direction
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Altocumulus clouds are defined as（）.
A.high clouds
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C.low clouds
D.vertical development clouds -
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Above-normal tides near the center of a hurricane maybe caused by the（）.
A.high barometric pressure
B.jet stream
C.storm surge
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A very light breeze that causes ripples on a small area of still water is a（）.
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