问题 单项选择题

大气污染是指大气中的污染物或由它转化成的二次污染物的浓度达到了有害程度的现象。造成大气污染的主要物质是______。

A.一氧化碳
B.二氧化碳
C.二氧化硫
D.氢氧化物

答案

参考答案:C

解析: 大气污染物主要分为有害气体(二氧化硫、氮氧化物、一氧化碳、碳氢化物、光化学烟雾和卤族元素等)及颗粒物(粉尘和酸雾、气溶胶等)。其巾二氧化硫是一种分布广、危害大的主要大气污染物。

单项选择题 A1型题
阅读理解

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Newspapers are not nearly as popular today as they were in the past.There are not very many people who seriously read a newspaper every day. Most people read only the sports pages,the advice or the gossip columns,the comics, and perhaps the classified advertisements.Most people don’t take the time to read the real news. Newspapers attempt to catch the reader’s interest with pictures and exciting headlines. These techniques are used on the front page because it is the first thing you see when you pick up the paper.The first page attracts attention and encourages the reader to look through the rest of the paper. This is why editors always look for a good first page story and headline to make them stop and look.If the headline is horrible enough or frightening enough or wild enough,perhaps they will go on to read the front page.However,they may just read the headlines,but that is all,then they turn to the sports page,or comics,or advertisements. It seems that people do not want the news from a newspaper anymore. They say they get the news on the television now.

More people watch television news because it is easier and more interesting than reading a newspaper.What about you? Do you read news from a newspaper? Do you think it is easier to get

the news from television? Or do you care about news at all? Would you mind if there were no news?

50.According to the passage,newspaper are________.

A.inure popular today                  B.less popular today

C.as popular as before                     D.getting more and more popular

51.We can know from the passage that the newspaper editors think the important part of the newspaper is___________.

A.the front page            B. the sports page

C.the headlines                 D.the classified advertisements

52.According to the author,which of the following newspapers will most probably attract the reader’s attention?

A.The ones with interesting pictures and exciting headlines on the front page.

B.The ones with sports news on the front page.

C.The ones with classified ads on the front page.

D.The ones with gossip columns on the front p