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(頭暈) 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 文章講述了smoking對(duì)人的危害的論述文,通過(guò)說(shuō)明Cigarette的來(lái)由,somking對(duì)身體的影響以及人們對(duì)smoking危害人的知識(shí),從而總結(jié)了smoking對(duì)人的危害.

解答 21.D 細(xì)節(jié)理解題.從第一段的第二句中的what is now part of the United State看出是美國(guó).故選D.
22.C 細(xì)節(jié)理解題.根據(jù)"Nicotine can make new smokers feel dizzy(頭暈) 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."尼古丁可以使新吸煙者頭暈(頭暈)或生病,年輕吸煙者心率每分鐘增加2到3次還可降低皮膚溫度,越來(lái)越多的吸煙者'患有心臟病和中風(fēng).故選C.
23.B 細(xì)節(jié)理解題.第一段說(shuō)明cigarette的來(lái)由,第二段說(shuō)明smoking對(duì)身體的影響,第三段說(shuō)明人們對(duì)smoking危害性的認(rèn)識(shí),第四段總結(jié)smoking對(duì)人的危害.故選B.

點(diǎn)評(píng) 本文是一個(gè)科教類閱讀,題目涉及多道細(xì)節(jié)理解題,做題時(shí)結(jié)合原文和題目有針對(duì)性的找出相關(guān)語(yǔ)句進(jìn)行仔細(xì)分析,結(jié)合選項(xiàng)選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測(cè),一定要做到有理有據(jù).

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