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【单选题】
听力原文:W: I'm thinking about dropping my swimming class, I'm just not catching on. M: Hold on to it, I did and I learned how to swim eventually. Q: What can be inferred about the man? (16)
A.
He wants to quit the class too.
B.
He knows nothing about swimming.
C.
He made great efforts in learning to swim.
D.
He teaches swimming.
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细胞生命活动所需的能量均来自线粒体
B.
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