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问题 单项选择题

初次抗原刺激后，先产生的对传染病早期诊断有帮助的是（）

A.IgG

B.IgA

C.IgM

D.IgE

E.IgD

答案

参考答案：C

完形填空
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     Television has now come into nearly every family. It has    l   a very important part in    2   life. School children in the USA watch TV about twenty-five hours a    3   .Some parents feel the television is good    4    their children because it helps them learn about their country and the world.   5   the help of some programs(节目)of education(教育) ,children do    6   school.
        7   parents do not let their children    8   TV too much.They say the TV programs are not good and children may    9    bad things from them.
    Men have invented many things which have brought much convenience. Television is one of them. If it    10   carefully planned, watching TV can be good for children,
( )1. A. take
( )2. A. people
( )3. A. day
( )4. A. at
( )5. A. With
( )6. A. well in
( )7. A. Other
( )8. A. to watch
( )9. A. study
( )10. A. are  

B. taken
B. people's
B. morning
B. of
B. Under
B. good in
B. The other
B. watch
B. learn
B. will be  

C. took
C. peoples
C. year
C. for
C. By
C. better in
C. Another
C. watching
C. listen
C. was      

D. taking
D. peoples'
D. week
D. with
D. Below
D. best in
D. Others
D. watched
D. see
D. is      

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选择题

下列事实与原因对应关系不正确的是（　　）

 ABCD
图片
 推广使用无铅汽油吃水果有益于身体健康通常在船身上装锌块钢化玻璃常用于制造汽车或火车车窗
主要减少铅污染水果中富含蛋白质等营养物质防止钢铁发生腐蚀钢化玻璃强度大，且破碎后，碎块没有尖锐棱角
 
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