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

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问题 "Millions do it". In this sentence "do it" refers to_____. [br] Aeroplanes can climb quickly ______.

选项 A、in warm air
B、in cold air
C、when it reaches the polar region
D、only when the clouds are down low

答案 A

解析答案依据第二段第一句：Aeroplane can’t climb as…as in warm．即"飞机在冷空气中不像在热空气中爬升得那么高、那么快"。言外之意是在暖空气中爬升得快，故A项正确。

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