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问题
单项选择题
实验室检查中最可靠的感染证据是（）
A.IgM阳性
B.IgG阳性
C.IgM和IgG均阳性
D.临床标本中分离到SARS病毒
E.PCR阳性
答案
参考答案：
D
填空题
选择合适的单词填空。
Word Box: on book in front of chair gym
1.
What's it?
It's a ___________.
Where is it?
It's ___________ the desk.
2.
What's it ?
It's a ___________.
Where is it?
It's ___________ the blackboard.
3.
Where are they?
They are in the ___________.
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名词解释
卫生系统
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