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Its hard to get data on cloud cover because
A.the information from satellites is useless.
B.recent satellite data is not enough.
C.human observations are less acute than satellite data.
D.satellite data can't be combined with human observations.

A.the
B.
B.recent
C.
C.human
D.
D.satellite
E.


【参考答案】

B
事实细节题。由题干关键词dataoncloudcover定位至第四段开头。该段阐述了云层数据获取的艰难。第二句提及“从卫星获得的可靠信息在时间上不足以提供一个对未来的可靠预测”,由此揭示了艰难的原因,[B]与之相符,故为正确。第四段第二句只是提及卫星信息不足,并非useless,故排除[...

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