2. 职称英语
  3. "Millions do it". In this sentence "do it" refers to_____. [br] Aeroplanes usual

"Millions do it". In this sentence "do it" refers to_____. [br] Aeroplanes usual

游客2024-01-15  22
问题 "Millions do it". In this sentence "do it" refers to_____. [br] 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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