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问题 填空题

在数轴上原点两边与原点距离相等的点中，若其中一个点表示3，则另一个点表示______；若其中一个点表示-4.5，则另一个点表示______；若其中一个点表示数a，则另一个点表示______．

答案

根据题意，答案为-3； 4.5；-a．

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。

Dear Sir，

How are you? As a exchange student，I am writing to tell you I would prefer to move into a single room in next term，

as I find that inconvenient to share a room with others. My roommate often held parties at night, made much noise.

Besides, his friends are always visiting him, that disturb me a lot. So I hope to draw your attentions to this problem. If

you think in my position，I am sure he will agree that the only solution for me is get a room of my own，one not in the

same building but as near to the school campus as possible. I would be gratefully if you could do me the favor.

Best wishes.

Yours sincerely，

Li Ming
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多项选择题

访客对讲系统一般由( )等部分构成。

A．单元门口主机
B．用户分机
C．电控门锁
D．访客监视系统
E．供电电源及管理主机
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