第2题
()may be a warning for an approaching storm.
A.the presence of cirrus clouds
B.the low-hanging stratus clouds
C.the altocumulus clouds
D.the massive cumulus clouds
第3题
A、A. cirrus
B、B. cirrocumulus
C、C. altocumulus
D、D. Cumulonimbus
第4题
A.cold front
B.warm front
C.tropical front
D.occluded frontCirrus
第5题
A.Occluded front
B.Stationary front
C.Warm front
D.Cold front
第6题
A、Cumulonimbus cloud line where the jetstream crosses the cold front
B、Cirrus clouds on the equatorial side of the jetstream
C、Cirrostratus cloud band on the polar side and under the jetstream
第7题
A.warm front
B.occluded front
C.medium front
D.cold front
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