Question

阅读理解 　　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．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 2 to 3 beats 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． (1) Tobacco first appeared in ________． [　　] A． Asia B． Africa C． Europe D． America (2) ________ doesn’t make one’s heart beat as usual． [　　] A． Tar B． Nicotine C． Lung disease D． Leave (3) Smoking is dangerous because ________． [　　] A． it makes us live longer B． it can waste money C． it can make us warm D． it causes lung cancer (4) What’s the main idea of this passage? [　　] A． Where did cigarettes come from． B． The affect of smoking on your body． C． How to smoke is healthy． D． Who is the first smoker．

Answer 1

答案：1．D;2．B;3．D;4．B;
解析：

(1)	从第一段的第二句中的“…what is now part of the United States”看出是美国。
(2)	从第二段的第三句看出“Nicotine…causes the heart to beat faster…”看出尼古丁使人心跳加速。
(3)	从最后一段的第一句“The Cigarette smoking was the cause of lung cancer…”看出应选D项。B和C项不能回答dangerous(危险)。
(4)	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危害人的认识，第四段总结smoking对人的危害。