问题 选择题

下列实验方法合理的是(   )

A.为准确测定盐酸与溶液反应的中和热,所用酸和碱的物质的量相等。

B.在酸、碱中和滴终点时不慎滴入过量标准溶液,可用装有待测液的滴定管再滴入一定量溶液进行调整。

C.配制的盐酸500,应选用的仪器有:胶头滴管、烧杯、玻璃棒、天平、500容量瓶。

D.将食用盐溶于水,然后滴入淀粉溶液,来检验食盐是否是加碘食盐。

答案

答案:B

A 错误,应该有一种物质稍过量

B 正确,如果酸过量,可用待测液碱来调整,以补救实验

C 错误,配置的溶液溶质是液体,不用天平称量,应用量筒测量体积。

D 错误,食用盐中不存在碘单质,不能用淀粉溶液直接检验食盐是否是加碘食盐

阅读理解

        The new book Harry Potter and the Half-Blood is warmly welcomed by the children in China. It sells well across China. You can see and hear the advertisements about the book here and there.

        Why is the book so attractive to children? After reading it, I was attracted by the magic world. I can not help asking: where is our own Harry Potter?

        China has a long history and colorful culture. With a large market of teenagers, China published(出版)many popular books among children. However, why are the present books not as good as those foreign ones?    

        Firstly, quite a number of children's books are written for teaching, and they have little interest. Reading them, children often have a feeling of being “educated”. Certainly, they don't like them. Secondly, fewer children like the same stories, but most Chinese books are usually much the same. One knows the ending as early as in the beginning. Finally, the writers seldom think about children's needs.

        First-class Reading, for children should be interesting, and written in their language.

1. About the present Chinese children's books, which is NOT right?  

A. They have little interest.            

B. Our writers seldom know children's needs.  

C. Most of them are the same.          

D. They are better than foreign ones.

2. Harry Potter is so poplar, because________.  

A. it's the same as Chinese books      

B. it can lead children into a wonderful world  

C. it's not written in children's language  

D. it's advertised more often on TV or posters

3. The Chinese meaning of the underlined phrase “First-class Reading” is_______.  

A. 第一批读物    

B. 一节课的阅读    

C. 一流的读物    

D. 基础的阅读

4. Which is the best title of the passage?  

A. Ways to read books.                

B. A magic boy, Harry Potter.  

C. Books and advertisements.          

D. Our children need better books.

名词解释