单选题It’s 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 he combined with human observations.

题目
单选题
It’s 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 he combined with human observations.

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