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
456***108
2024-12-26 10:06:43
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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