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______ cannot live without oxygen. [br] Breathing is difficult ______ .A、when yo
______ cannot live without oxygen. [br] Breathing is difficult ______ .A、when yo
游客
2024-07-23
19
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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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