问题 选择题

吸烟有害健康.因此从今年5月1日起,室内公共场所禁止吸烟.凡在公共场所吸烟的人,我们要晓以利害,坚决制止.关于吸烟危害的叙述,你不认同的是(  )

A.烟内含有的尼古丁能引起神经系统的兴奋性,促进新陈代谢

B.吸烟者患癌症的死亡率比不吸烟者高25倍

C.吸烟会导致他人被动吸烟,害己更害人

D.吸烟是引发心脑血管等疾病的重要因素

答案

香烟中含有1400多种成分.吸烟时产生烟雾里有40多种致癌物质,还有十多种会促进癌发展的物质,其中对人体危害最大的是尼古丁、一氧化碳焦油和多种其它金属化合物.一支烟所含的尼古丁就足以杀死一只小白鼠.香烟烟雾中大量的一氧化碳同血红蛋白的结合能力比氧大240-300倍,严重地削弱了红细胞的携氧能力,因此,吸烟使血液凝结加快,容易引起心肌梗塞、中风、心肌缺氧等心血管疾病.更为严重的是,吸烟者还严重妨碍他人健康.研究结果表明,吸烟者吸烟时对旁人的危害比对他自己还大.有关医学研究表明,吸烟是心脑血管疾病、癌症、慢性阻塞性肺病等多种疾患的行为危害因素,吸烟已成为继高血压之后的第二号全球杀手.据统计,长期吸烟者的肺癌发病率比不吸烟者高10倍至20倍,喉癌发病率高6至10倍,冠心病发病率高2至3倍,循环系统发病率高3倍,气管类发病率高2至8倍.可见A符合题意.

故选:A

阅读理解

Hundreds of years ago, life was much harder than it is today. People didn’t have modern machines. There was no modern medicine, either.     Life today has brought new problems. One of the biggest is pollution (污染). Water pollution has made our rivers and lakes dirty. It kills our fish and polluted our drinking water. Noise pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution. It’s bad to all living things in the world.     Cars, planes and factories all pollute our air every day. Sometimes the polluted air is so thick that it is like a quilt over a city. This kind of quilt is called smog(烟雾).

Many countries are making rules to fight pollution. Factories must now clean their water before it is thrown away, they mustn’t blow dirty smoke into the air.     We need to do many other things. We can put waste things in the dustbin and not throw it on the ground. We can go to work by bus or with our friends in the same car. If there are fewer people driving, there will be less pollution.

Rules are not enough. Every person must help to fight pollution.

小题1: Hundreds of years ago, life was much harder than it is today because _______.

A.there were not any modern machines

B.there was no modern medicine

C.both A and B

D.there were not many people小题2: What is the biggest problem in today’s life?

A.Water pollution

B.Air pollution

C.Noise

D.Pollution小题3:The most serious kind of pollution is ________.

A.noise pollution

B.air pollution

C.water pollution

D.A, B and C小题4: Factories must clean their water ________.

A.before they are thrown away

B.when they are thrown away

C.after it is thrown away

D.before it is thrown away小题5:From the passage we know that ________.

A.a few years ago, there was no smog at all

B.today people don’t have to talk to each other in a loud voice

C.we can drink water from the polluted rivers and lakes’

D.people are making rules in order to fight pollution

判断题