问题 选择题

下列说法正确的是

A.用盐析法分离NaCl溶液和淀粉胶体

B.除去苯中少量苯酚,向混合物中加人足量的NaOH溶液后过滤

C.加足量的稀盐酸可除去BaCO3固体中少量的BaSO4

D.向硝酸银稀溶液中逐滴加人稀氨水至白色沉淀恰好溶解,即得银氨溶液

答案

答案:D

题目分析:A中应是渗析,错误;B中加人足量的NaOH溶液后,苯酚可转化成可溶性盐苯酚钠,应通过分液分离,错误;C中加足量的稀盐酸可除去BaCO3而少量的BaSO4不溶,错误;D正确。

单项选择题 A1/A2型题
阅读理解

阅读理解。

     AAAGH! The Generation 90s is coming!

     Wearing earphones, using complex Net language and constantly text messaging friends, the Gen-90s

following the Gen-80s begin to make their world debut (初次登台). Each generation or age group has its own

symbols and lifestyle. Read on and judge for yourselves if you fit the Gen-90s profile (概况,简介).

      Earphones

      These little devices seem to grow on the heads of the Gen-90s.They might lead to MP3, MP4 or MP101

players, giving these young people a plugged-in,cool and perhaps self-addicted look, of course, life is not

always music to the ears. Martian language

     They have created their own code-like online language. It's a mixture of English, Japanese and Chinese that

perhaps only Martians can understand. This is an imaginative generation, though they need to be careful to keep

it out of their term papers.

     Self-Portrait(肖像)

     Saying"cheese" to their own digital cameras is routine for this generation. A little bit of narcissism(自恋)

never hurts anyone. It helps them reflect a little on their own lives. But be aware of the risks of posting private

photos online.

     Text-messaging

     They can type their mobile phones as fast as they can speak. This is a generation that respects efficiency.

However, oral communication is important and will never go out of style.

1. Who are the intended readers of the passage?

A. Teenagers

B. Educators

C. Socialists

D. Parents

2. According to the passage, if you belong to the Gen-90s, you will ______.

A. just appreciate yourself and ignore others' strengths.

B. make your presentation and have your own symbols and lifestyle.

C. have the same symbols and lifestyle of the Gen-80s.

D. like music and dance very much.

3. According to the text, the writer will choose ______ as a good example to the Gen-90.

A. Li Hua likes music and always wearing ipod

B. Zhang Chao is not only an imaginative boy but do everything efficiently

C. Lily is a shy girl and she doesn't like making friends

D. Fangfang likes being taken photos of and often posting them on line

4. According to this passage, which is FALSE?

A. Not all teens are cautious about posting photos.

B. They type their mobile phones so fast that it can catch the speed of speaking.

C. The Gen-90s have a preference for some music players, and even regard them as a necessary part of life.

D. They don't use the cool and complex online language in formal writing.

5. The main idea of the passage is about_______.

A. the Gen-90s' happy life

B. the difference between the Gen-80s and the Gen-90s

C. the Gen-90s' unique lifestyle and some practical warnings

D. the similarities between the Gen-80s and the Gen-90s