问题 填空题

将硝酸放于棕色瓶中,避光保存是为了防止()。

答案

参考答案:硝酸分解

选择题
阅读理解

阅读理解

     Pop music is the name for different forms of popular, commercial(商业) music. It had its beginning in

the USA and spread throughout the whole world during the 1950s and 1960s. It is widely liked by the young people. The best known early form of pop music was "rock' n' roll"; another was "blues". A more

recent development is "folk-rock". Pop music has taken the place of native music in many parts of the

world; it has caused the number of people for jazz to become much smaller than it was in the 1950s and

earlier, and it has now begun to rule musical stage productions. It's a big industry. Much pop music is

without artistic value, but the work of some pop singers, e.g. the Beatles, Bob Dylan, the groups like

Floyd and Crosby, Stills and Nash, is on a higher musical level. And there is still a great interest in it today. Pop music concerts and festivals are held all over the world.

1. All of the following forms belong to pop music EXCEPT _____.

A. blues      

B. rock' n 'roll    

C. jazz      

D. folk-rock

2. According to the article, the number of people for jazz in the 1950s and earlier was _____ it is today.

A. much greater than  

B. much smaller than  

C. as great as  

D. as small as

3. Which of the following is TRUE?

A. No pop music is on a high musical level.

B. Much pop music is very artistic.

C. Pop music is highly artistic.

D. Not all pop music is without artistic value.

4. "It is a big industry" means that _____.

A. it makes a lot of musical instruments (乐器)

B. it is a big musical and commercial business

C. the pop singers are very hard-working

D. pop music is on a very high musical level