2. 外语
  3. "Millions do it". In this sentence "do it" refers to_____. Aeroplanes usually do not need to climb quickly or fly high in the p

"Millions do it". In this sentence "do it" refers to_____. Aeroplanes usually do not need to climb quickly or fly high in the p

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问题 "Millions do it". In this sentence "do it" refers to_____.
Aeroplanes usually do not need to climb quickly or fly high in the polar region because ______.
选项 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
答案B
解析 答案依据第二段最后两句：Nor can clouds．"云在冷空气中上升得也慢"；In practice，this is an advantage…keeps the clouds down low．"实际上，这是对飞机的有利条件，当它到达北极上空的时候已经相当高了，不需要继续爬升，同时冷空气将云压低(这样不至于对飞机的飞行有不良影响)"。由这两句可知，在北极上空，空气较冷，冷空气将云向下压，云无法上升得很高，不会对飞机的飞行造成影响，故B项正确。
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