问题 选择题

下列叙述I和II均正确,且有因果关系的是

答案

答案:A

题目分析: B项,Fe3+遇到硫氰酸钾显红色,因为两者形成硫氰酸铁显红色。C项,F比Cl的非金属性强,可以通过比较其气态氢化物的稳定性或者最高价氧化物对应水化物的酸性,但F没有最高价氧化物存在。D项,氯酸钾电离不产生Cl-

阅读理解

D

In China, some radio broadcasting stations use hotlines to encourage listeners to take part in the talk shows.

That is a good idea. Yes, the fact is that some people do nothing but break the whole programme.

Some people know little about the topic under discussion. Sometimes they do not even know what the host is talking about. So the host has to tell the caller what the show is about. Usually the caller will ask a few questions which express his hope and show his ignorance(无知). Then the host has to answer and explain ---how silly it is! It wastes a lot of time.

It seems that some people phone the hotlines for fun. They just want to let the listeners hear them. They do not care what the topic is, whether they themselves are interested in the topic or how silly they appear to be.

It is necessary for radio stations to improve the hotline programmes. In my opinion, if a caller does not know what is going on, the operator should not let the caller take part in it.

47. The underlined sentence “some people do nothing but break the whole programme” may tell us that _____

A. radio stations use hotlines in a wrong way

B. there are problems to solve in the use of hotlines by some radio broadcasting stations

C. the use of hotlines by some radio broadcasting stations is a good idea

D. some people have unclear thoughts

48. The underlined word“operator” in the last paragraph refers to_____

A. 话务员        B. 听众        C. 医生         D. 主持人

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