单选题
How is the image of the north polar cap of Mars?
A、
Vague.
B、
Clear.
C、
Cannot be seen.
D、
Barely visible.
【正确答案】
B
【答案解析】
[注释] 见第一段第四句In these views the north polar cap is turned toward the Earth and is clearly visible at the top of each picture.可以用题干中的north polar cap作为信号词在文章中进行扫描来找到这个依据句。
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