请用不超过150字的篇幅，概括出给定资料所反映的主要问题。

搜题请搜索小程序“爱下问搜题”

问题问答题

答案

参考答案：提示一
　　通过手机短信传播有害信息，是当前利用现代化科技手段进行违法犯罪的一个突出问题。一方面，少数不良分子利用它传播黄色、欺诈信息，毒化社会风气；另一方面，更应引以警惕的是，境内外极少数敌对分子企图利用它编造、散布各种谣言，引发社会恐慌，破坏社会稳定；

选择题

证明溴乙烷中溴元素的存在，下列操作步骤中正确的是( )

①加入硝酸银溶液②加入氢氧化钠溶液③加热④加入蒸馏水⑤加入稀硝酸至溶液呈酸性⑥加入氢氧化钠醇溶液

A．④③①⑤

B．②③⑤①

C．④⑥③①

D．⑥③⑤①

查看答案

阅读理解

Hello. It’s one of the first words we learn as babies, yet it’s one of the last ones we think to use as adults. That’s unfortunate, b 48 saying hello is more than just saying hello—it is recognition of another’s worth. How might the world change—how might we change—if we mastered this word? To find o 49 , I spent one month saying hello to every person I met. Here’s what I’ve learned. It can boost （促进） productivity. In one of the few studies ever done on this subject, Allan Allday, a 50 assistant professor of special education at Oklahoma State University, had middle school teachers greet their students individually each morning. This exchange of greetings raised the kids’ productivity. School went from impersonal to p 51 , and that resulted in more class participation and better grades.

Environments influence friendliness, One study found that people in the city were more likely to kiss one hand with a stranger than those in the countryside. And researchers say，pleasure environments generally encourage more smiles and hellos t 52 unpleasant ones. My experience was similarly. Whatever the reason, my urban hellos were answered far l 53 often than my rural one. Similarly, people in vacation spots, l 54 the Jersey Shore, were far friendlier than those hurrying work downtown.

It’s a form of universal health insurance. It’s impossible to say hello w 55 smiling. And smiling has been shown to lower blood pressure, relieve stress and boost happiness. Apparently, a smile creates a similar effect in the recipient （接受者）。

查看答案