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【单选题】
引起内源性感染的机制不包括A.
严重创伤导致病原菌侵入体内繁殖
B.
长期使用抗生素破坏正常菌群
C.
条件致病菌在人体内的异常定植与增殖
D.
长期应用免疫抑制剂
E.
生理机能紊乱导致菌群失调
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皮皮学刷刷变学霸
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A.
who
B.
that
C.
what
D.
which
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【简答题】Helen was much kinder to her youngest son than to the others, , of course , made the others envy him . A. who B. that C. what D. which
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