问题 填空题

某兴趣小组将大小相同的若干块棉布在五份不同体积分数的酒精溶液中浸透后取出点火,做了“烧不坏的棉布”的实验。其实验结果如下表:

(1)你推测⑤的实验现象是_____________;

(2)综合所学知识,分析②③中“酒精烧完,棉布无损”的原因:_____________。

(3)实验室里的酒精灯常出现灯内有酒精却点不燃的现象,你认为可能的原因是____________。

答案

(1)不燃烧

(2)②③酒精溶液中含水量较多,酒精燃烧引起水分蒸发带走热量,使棉布的温度达不到其着火点,故棉布不能燃烧

(3)用完酒精灯时未盖灯帽,导致酒精挥发,灯芯上水分过多(或灯芯烧焦等)

单项选择题
阅读理解

B

China will plan to make new rules to give more controls over the growing number of blogs and webcasts.

Nowadays, advanced network technologies, such as Hogging and webcasting, are being improved to challenge the government’s ability to watch over the Internet.

Chinese government was in the middle of making new rules over Internet publishing, and blogs and websites that publishing webcasts would fall under these rules.

Government officials hope the new rules would ensure a more healthy and active Internet environment and would fully respect and protect Chinese citizens' freedom of speech. Specific details on what kind of rules would be carried out are still unknown to the public.

Despite the growing popularity, bloggers and webcasters have been unpopular with publication institutions.

In 2006, a series of cases involving bloggers who had dived into other people’s privacy and written materials ruining other’s fame urged the government to consider whether to require bloggers to use their real names when they login in.

Webcasting without copyright and illegally “copying" products from copyrighted materials have also led government officials to consider starting a nationwide check of online video broadcasting, and allow only qualified websites to continue offering webcasts.

60.What can be the best title of the passage?

A.The Increases of Blogs and Webcasts. 

B.New Rules to Control Internet Publishing.

C.Technologies Challenge the Government.

D.The Popularity of Online Video Broadcasting.

61.Chinese government thinks current Internet environment is ______.

A.quite healthy         B.less active            C. rather hopeful       D.less piloted

62.Which of the following is TRUE according to the passage?

A.Publication institutions are unhappy with bloggers and webcasters.

B.All bloggers and webcasters like to dig out other people’s privacy.

C.Webcasters are quite aware of the copyright issues while online.

D.Copyrighted materials can only be offered to qualified websites.