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问题 单项选择题 A1/A2型题

关于分子生物学诊断方法在流行病学研究中的描述，错误的是（）。

A.判断传染病流行是单株还是多株感染

B.有助于识别可能的传播宿主及途径

C.识别高毒株，追踪难以培养的传染因子

D.鉴定新的微生物

E.查找传染源

答案

参考答案：E

单项选择题

Water is (41) important of all the things we (42) and drink. Not many people understand this, (43) it’s quite true. The human body (人体) can go (44) food for a long time, but two (45) three days without water can usually (46) people die.
Many people don’ t understand how much water the human body needs to work well and many people do not drink (47) , even (48) hot weather.
Our body is (49) water, about 65% to 75%, ff we do not have enough water, we’ll (50) tired and many will get ill. So you see, how important water is to us all.

[A] make [B] get[C] let
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单项选择题

一个时代的士人所共有的价值取向和精神状态即为“士风”。唐朝前期，士人常思济苍生、安社稷，参政热情空前高涨，反映出蓬勃向上的时代精神。推动这种“士风”形成的因素有（）

①政治相对开明②庶族士人崛起③科举制度兴起④内忧外患频仍

A.①②③

B.②③④

C.①②④

D.①③④
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