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问题 单项选择题

医院感染是指

A．入院时出现的感染症状
B．住院期间出现的感染症状
C．住院期间发生的感染和医院内获得出院后发生的感染
D．入院时已处于潜伏期的感染
E．出院时已处于潜伏期的感染

答案

参考答案：C

解析：医院感染的定义为：住院患者在医院内获得的感染，包括在住院期间发生的感染和在医院内获得出院后发生的感染；但不包括入院前已开始或入院时已存在的感染。

听力题

根据下列短文内容，在短文后的空格处填上一个恰当的词，使短文完整、通顺

On weekdays American students usually get up at seven. Then they___小题1:___their teeth and have____小题2:__. After breakfast they___小题3:___to school on foot or on the yellow school bus. Some students ride their bikes. They get to school at____小题4: _eight thirty. Students have lunch ____小题5:__school. They don't have a sleep（睡觉）at noon. After school they go____小题6: _at half past three. Students usually play or__小题7:____TV before dinner.  They eat dinner at six in the evening. After dinner they do their____小题8:__. They don't have much homework to do every day，so they usually go to bed early.
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单项选择题

化学物的致癌机制复杂，影响因素多，对动物致癌的化合物不一定对人类致癌。

要确定化学物对动物致癌最有价值的试验是

A．骨髓细胞微核试验

B．程序外DNA合成试验

C．小鼠肺肿瘤诱发试验

D．细胞转化试验

E．哺乳动物长期致癌试验
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