Aeroplanes usually do not need to climb quickly or
Aeroplanes usually do not need to climb quickly or fly high in the polar region because ______ 查看材料
A.they do not land there
B.there are no clouds at all
C.they can cross the ice with special equipment
D.it is very cold
请帮忙给出正确答案和分析,谢谢!
参考解答
正确答案:B
判断推理题,文中最后一句话说冷空气使云层也降低了,也就是说在高空是没有云的,所以选B。
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