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问题 单项选择题

室性期前收缩（）

A.提前出现的QRS波群，宽大畸形

B.P波与QRS波群无关

C.PR间期逐渐延长，继之QRS波群脱落，呈周期性

D.PR间期固定，有时QRS波群脱落

E.PR间期延长

答案

参考答案：A

翻译题

阅读下面短文，然后根据括号内所给汉语意思写出单词的正确形式（每空一词）。

At   小题1:  ( 目前 ), teenagers want to be independent ( 独立的) from their parents as   小题2:  ( 快地 ) as possible. Many parents are   小题3:  ( 焦虑的 ) about it . Most teenagers are the only child in their family. They are always  小题4:（视为）as the little kids by their parents. But I think teenagers should be allowed to be independent because they have to   小题5: ( 面对 ) the challenges and difficulties in the future by   小题6:( 他们). So learning to be independent   小题7: ( 似乎) very important. 小题8: （无论什么）they do, I think teenagers should learn to do it on their own.It’s a really exciting experience. Teenagers shouldn't be  小题9: (害怕的) of learning to be independent,   小题10: (虽然）there will be some trouble. Nothing is impossible and they will take pride in themselves in the future.
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单项选择题

假定资本家投入100万元的资本，其中不变资本80万元（假定不变资本一次转移），可变资本20万元。雇佣劳动者生产出来的商品价值为120万元，那么剩余价值率是（）

A．50％

B．100％

C．150％

D．200％
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