cannot live without oxygen. [br] Breathing is difficult .A、when yo

游客2023-10-05 72

问题 ______ cannot live without oxygen. [br] Breathing is difficult ______ .

选项 A、when you get to the top of a high mountain
B、when you try to climb a high mountain
C、when you fly in a plane
D、when you get to the foot of a high mountain

答案 A

解析本题题干问“什么时候呼吸会变得困难”。原文第2段第2句话指出在山顶上呼吸会变得困难。因此选项A，when you get to the top of a high mountain是正确答案。

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