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问题 单项选择题

急性肾小球肾炎前驱感染史通常为

A．链球菌感染后1～3周

B．链球菌感染后6个月

C．链球菌感染后3～4天

D．链球菌感染后1个月

E．链球菌感染后1年

答案

参考答案：A

解析：急性肾小球肾炎常有前驱感染史，尤以扁桃体炎多见，感染后1～3周出现肾炎临床表现。

完形填空

根据短文内容和所给汉语提示，写出单词的正确形式。每空限填一词。

Mr. Jackson says his favorite great book is The Adventures of Tom Sawyer.  It was小题1: (写）by Mark Twain in the  19th 小题2:_____(世纪）   The  story  is about  a小题3:_____(活泼的）and clever young boy Tom and his friends.  They go looking for treasure(宝藏）on an 小题4:____(岛）in the middle of the Mississippi River.  Mr.  Jackson thinks his favorite scene in the book is when everyone thinks Tom is 小题5:_____(死的）and has a funeral(葬礼），but Tom 小题6:_____(躲藏）and watches，and then suddenly he appears.  The ending of the story really 小题7:_____(使'原奇）everyone.  The themes of the  story are to do with children growing up and becoming more serious.

At the same time，it talks about freedom,  social 小题8:_____(规则)  and how people are punished(惩罚）for bad behaviors.  Finally,  Mr. Jackson asks us to read the book. He is sure if we can put our 小题9:_____(心）into it, we can understand the story 小题10:_____( 容易) .
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选择题

个位数字为a，十位数字为b，则这个两位数可用代数式表示为[ ]

A．ab

B．ba

C．10a+b

D．10b+a
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