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7.People have smoked cigarettes for a long time now.The tobacco which is used to make cigarettes was first grown in what is now part of the United States.Christopher Columbus,who discovered America,saw the Indians smoking.Soon the dried leaves were transported to Europe where smoking began to catchon.In the late 1800s,the Turks made cigarettes popular.
Cigarette smoke contains at least two harmful substances,tar and nicotine.Tar,which forms as the tobacco burns,damages the lungs and therefore affects breathing.Nicotine,which is found in the leaves,causes the heart to beat faster and increases the breathing rate.Nicotine in large can kill a person by stopping a person's breathing muscles.Smokers usually take in small amounts that the body can quickly break down.
Nicotine can make new smokers feel dizzy(头晕) or sick to their stomachs.The heart rate for young smokers increases 2to 3beats per minute.Nicotine also lowers skin temperature and reduces blood flow in the legs and feet.It plays an important role in increasing smokers'risk of heart disease and stroke.
Smoking cigarettes is dangerous.Cigarette smoking was the cause of lung cancer and several other deadly diseases.
21..Tobacco first appeared inD.
A.Asia     B.Africa    C.Europe     D.America
22.The following effects are caused by Nicotine EXCEPT thatC.
A.It can make new smokers feel dizzy or sick to their stomachs
B.It lowers skin temperature
C.It causes the heart to beat less fast
D.Nicotine will probably kill a person if a smoker takes in too much of it.
23.What's the main idea of this passage?B
A.Where did cigarettes come from?
B.The effect of smoking on your body.
C.How to smoke is healthy?
D.Who is the first smoker?

分析 文章讲述了smoking对人的危害的论述文,通过说明Cigarette的来由,somking对身体的影响以及人们对smoking危害人的知识,从而总结了smoking对人的危害.

解答 21.D 细节理解题.从第一段的第二句中的what is now part of the United State看出是美国.故选D.
22.C 细节理解题.根据"Nicotine can make new smokers feel dizzy(头晕) or sick to their stomachs.The heart rate for young smokers increases 2to 3beats per minute.Nicotine also lowers skin temperature and reduces blood flow in the legs and feet.It plays an important role in increasing smokers'risk of heart disease and stroke."尼古丁可以使新吸烟者头晕(头晕)或生病,年轻吸烟者心率每分钟增加2到3次还可降低皮肤温度,越来越多的吸烟者'患有心脏病和中风.故选C.
23.B 细节理解题.第一段说明cigarette的来由,第二段说明smoking对身体的影响,第三段说明人们对smoking危害性的认识,第四段总结smoking对人的危害.故选B.

点评 本文是一个科教类阅读,题目涉及多道细节理解题,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据.

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