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【单选题】
下列因素中哪项为职业性致癌因素A.
铅
B.
硫化氢
C.
苯
D.
一氧化碳
E.
二氧化碳
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反馈参考答案：
举一反三
【单选题】— Will Helen get disappointed if I tell her she failed? — I think she _____. [ ]
A.
may
B.
has to
C.
should
D.
need
【单选题】Helen _____ her key in the office so she had to wait until her husband _____ home.
A.
had left; came
B.
has left; come
C.
left; had come
D.
had left; come
【简答题】Helen _____ her key in the office so she had to wait until her husband _____ home.A. has left; comes B. left; had come C. had left; came D. had left; would come
【多选题】多选题-以下两性生理上差异的表述哪一个正确
A.
女性没有不应期,性能力更强
B.
男性有不应期
C.
女性能够生育后代的数量更多
D.
男性能够繁衍后代的时间比女性长得多
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