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问题 单项选择题

患者消化道大出血，收缩压降至70～90mmHg，脉率增至130次／分，表示出血量约达全身总血量的（）

A.15%

B.20%

C.25%

D.30%

E.35%

答案

参考答案：C

单项选择题

( )的生产周期最长。

A．顺序移动方式

B．平行移动方式

C．平行顺序移动方式

D．三种方法生产周期一样长
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单项选择题

Many students do not like tostudy history(历史)．They say that there are (41) many names and dates to (42) ．But if we do not know about the (43) ，we can not understand the present well．For example，if we wish to know how men (44) to use fire，we have to know what men did (45) the past to travel at night or to keep themselves (46) in cold nights．Only a study of history will make US realize(意识到) (47) everything we do today is the result of what (48) people did in the past．

[A] subjects [B] matters [C] things

As we (49) history，we learn many interesting (50) ．History helps US understand our present life better．
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