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问题 选择题

已知两圆的半径分别为3cm和7cm，圆心距为10cm，则这两圆的公切线条数是（　　）

A．1条

B．2条

C．3条

D．4条

答案

两圆的半径分别为3cm和7cm，

∵3+7=10，

∴两圆外切，

有3条公切线．

故选C．

改错题

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加，删除或修改。

增加：在缺词处加一个漏字符号（），并在其下面写出该加的词。

删除：把多余的词用斜线（）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者（从第11处起）不计分。

Did you enjoy yourself yesterday? I suppose you did. But I’d like to tell you how a bad day I had yesterday. Nothing just went wrong. On the morning, my alarm clock didn’t ring, so I woke up an hour later, I was in such hurry that I burnt my hand when I was cooking breakfast. Then I ran out of the house to catch the 8:30 buses. This is the bus I usually take. But, you may laugh, I had missed it of course. I am very unhappy, and scared as well because my teacher hates the students come late to school. So I ran three miles to school only to discover that nobody was there. The school was quiet but peaceful. Our schoolroom was locked. I realized that it was Sunday.
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多项选择题

诊断膀胱破裂的方法有（）

A.导尿

B.导尿测漏试验

C.膀胱造影

D.膀胱镜检查

E.B超
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