题目内容

生理情况下，血液中调节呼吸的最重要因素是：

A. PCO2
B. PO2
C. [H+]
D. [OH-]
E. [HCO3-]

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1. ____ will leave for Beijing.

A. Now there the man
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D. The man is here now

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A. wet and cold
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4. He got up ____ yesterday morning.

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