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单选题
The presence of stratus clouds and a dying wind will usually result in（）.
A
heavy rain
B
heavy snow
C
thick fog
D
clearing skies
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单选题（）indicates unstable weather.A
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单选题（）may be a warning for an approaching storm.A
The persence of cirrus cloudsB
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单选题Altocumulus clouds are defined as（）.A
high cloudsB
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Cirrostratus clouds lined up in rows extending in a northeast to southwest directionD
Cirrostratus clouds lined up in rows extending in a north to south direction
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beach ( to )C
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the presence of the background light at nightB
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stationary frontC
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cold front
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