某地居民每两年检查身体一次，检查结果如下：有感染区：体检人数

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问题单项选择题

某地居民每两年检查身体一次，检查结果如下：有感染区：体检人数50人，新发生某病人数10人；未感染区：体检人数200人，新发生某病人数10人，则有感染区该病年发病率为

A．20%
B．10%
C．5%
D．2.5%
E．1%

答案

参考答案：B

改错题

One day I told Mr Wang,our math teacher,was ill. 61.________

I was worried about him and went to see him after the school. 62.________

When I enter his room,he struggled up to welcome 63.________

me.I let him lay down again.Mr Wang looked pale. 64.________

I asked about his trouble.He said he was having 65.________

a bad cold.Then he had a bad cough.After take some 66.________

medicine he was getting better.He asked me that we 67.________

liked the teacher who took place.When he heard 68.________

everything was all right,I could see he was pleasing. 69.________

Finally I asked him don’t to worry about the work 70.________

and have a good rest.

单项选择题

室外支撑件布缆施工时分离自承式蝶形引入光缆的吊线，并将吊线扎缚在S固定件上，然后拉挂在支撑件上，当需敷设的光缆长度超过（）米时，宜选择从中间点位置开始布放。

A、70

B、80

C、90

D、100