问题 单项选择题

小檗碱的鉴别反应是

A.漂白粉显色反应

B.碘化汞钾反应

C.硅钨酸试剂

D.雷氏铵盐试剂

E.碘化秘钾试剂

答案

参考答案:A

解析:小檗碱的鉴别反应是漂白粉显色反应和丙酮加成反应,故89题答案选A。其他选项的试剂是生物碱的沉淀反应试剂。

阅读理解

阅读理解。

    What's a blog? A blog is a personal online diary (日记). It's cool, it's hot, and everyone is doing it. People

talk about it often. Sound like a fashion? In fact, It's another trend (流行趋势). And the word "blogger" means

a person who writes diaries online. Are you a blogger?  

     Many bloggers are teenagers who log (进入) onto websites to discuss anything in their lives. Many of

today's teenagers are not afraid to openly discuss everything in their lives. Teenagers complain about their

parents and homework. They share diaries, post (发布) songs from the latest bands and show pictures of

theirs. They write their own poems, say something about their girlfriends or boyfriends and complain to each

other or offer support. But mostly they just write down what they do every day.  

     However, many parents are worried about these young bloggers. Parents see the kids talking about how

they got drunk last weekend and how they don't like studying. They are using the language that is surprising

to their parents. Besides hearing from their friends, teen bloggers also get messages from strangers. Most of

the time, it's older men asking to meet teenage girls. "These strange men are dangerous for my kids. They

sometimes teach my kids bad words." said Cara Cabral, a mother of two children.  

     Many teenagers and young adults know it's not safe to use blogs on the Internet. They know they are

putting information about themselves in a place where it can be seen by anyone. But teenagers are unwilling

to give up these new communication tools that have become a way of life for many of them.   

1. The underlined word "it" in the first paragraph means _____.  

A. the fashion

B. the Internet

C. the blog

2. Which of the following is NOT TRUE?  

A. Teenagers don't tell about their personal life in their blogs.  

B. Teenagers mostly write down what they do every day in their blogs.  

C. Teenagers complain about their parents and homework in their blogs.  

3. What's the main idea of the third paragraph?  

A. Many parents don't understand kids' language in their blogs.  

B. Many parents are worried about these young bloggers.   

C. Many parents can understand why their kids don't like studying. 

4. Many parents think it's _____ for their children to get messages from strangers.  

A. dangerous

B. interesting

C. surprising   

5. We can learn from the last paragraph that _____.  

A. It's easy for many teenagers to give up blogging on the Internet   

B. It's safe for many teenagers to put their personal information on the Internet  

C. It's popular for many teenagers to use blogs on the Internet 

问答题 简答题