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【单选题】
小儿受结核感染至出现PPD阳性反应的时间是A.
12~24小时
B.
24~48小时
C.
48~72小时
D.
2~4
E.
4~8
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反馈参考答案：
举一反三
【简答题】A．constant B．persisting C．stable D．lasting
【单选题】When We reached the station the train had not arrived yet；so we_______．
A.
neednt have hurried
B.
didn’t need to hurry
C.
need not to hurry
D.
had not needed to hurry
【单选题】Resveratrol is the fourth factor recently found that causes a breast cancer to develop.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】A．had B．enjoying C． D．lasting
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