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【单选题】
关于补体的叙述，错误的是A.
存在于正常人或动物血清中的一组不耐热的蛋白质
B.
具有酶活性的蛋白质
C.
其性质很不稳定
D.
其作用是非特异的
E.
补体在血清中含量随免疫原刺激而增高
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举一反三
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A.
B.
C.
D.
D
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【单选题】She__up the stairs, so as not to wake up her sleeping parents.
A.
crawled
B.
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C.
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D.
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