当x=______时，分式xx-5与2-xx-6互为相反数．_爱下问搜题

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问题填空题

当x=______时，分式

x

x-5

与

2-x

x-6

互为相反数．

答案

根据题意得

x

x-5

+

2-x

x-6

=0，

方程两边都乘（x-5）（x-6），

得x（x-6）+（x-5）（2-x）=0，

解得x=10，

经检验x=10是原方程的解．

故答案为10．

完形填空

Today’s young people are taking a more active part in online activities. Although the Internet can be 21 for students to collect information and communicate（交流）with their friends, teachers and parents are becoming more and more 22 about the unhealthy web content（网上内容）in the bar. They think that the birth of “Harm-free Internet Bars”（健康网吧）is 23 step to 24 teenagers.
It was Sunday afternoon and there were not many 25 seats left in the Feiyu Internet Bar. A few 26 were found playing 27 . A person of the bar was walking around 28 Internet users’ online activities.
“My job is to find anyone who is looking at 29 websites and then 30 them from doing so,” he said. “This is a 31 of the ‘Harm-free Internet Bar’project”. Feiyu, a famous Internet bar in Beijing is among the first 19 to 32 the harm-free Internet bar club.
In order to help start a better 33 for teenagers’ online activities, China’s Communist Youth League has brought out the program named “Harm-free Internet Bar for Teens”.
But while teachers and parents 34 the “harm-free Internet bars”, 35 do many school students think of them?

D．interesting

C．an important

D．an impossible

A．comfortable

D．online games

A．interesting

B．environment

C．Internet bar

A．complain about

B．worry about

单项选择题

文字成为记录文化的有效工具是从意音文字开始的。美索不达米亚的钉头字、埃及的圣书字、中美洲的玛雅字、中国汉字等都是意音文字。______。现在，绝大部分著名的意音文字都成为历史陈迹了，只有汉字，作为意音文字在今天的世界上巍然独存。
填入横线上最恰当的是( )。

A．它们在各自的地区留下了早期文化的灿烂记录
B．它们辉煌了很长的一段时间，大都已经销声匿迹
C．使用这些文字的地区都是人类早期文化的发源地
D．意音文字后来被具有音节特点的拼音文字取代了