【单选题】【消耗次数：1】
月经的出现是由于
①
血中孕激素、雌激素急剧减少
②
血中孕激素急剧减少
③
血中雌激素急剧减少
④
血中前列腺素急剧减少
⑤
血中孕激素、雌激素急剧升高
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简述各种严重病因可能通过哪些环节引起有效循环血量急剧减少，从而发生休克?
【单选题】
血中激素浓度极低，但生理作用却非常明显，这是因为（ ）
①
激素的半衰期非常长
②
激素的特异性很高
③
激素分泌的持续时间非常长
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细
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comeround
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comealong
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comeon
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comeout
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The inspector ____ his fingers over the sheet of newspaper. There were some marks on the surface of the paper.
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turned
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Sure，withpleasure
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Okay，pleaseyourself
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Yes，helpyourself
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for
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criminal
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inspiteof
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inhonorof
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makefor
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makesure
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makeover
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①
perceive
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distingusih
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sight
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observe
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①
appointment
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