吸烟和癌症(Smoking and Cancer)
Smoking is harmful to the health of people . It not oilly pollutes air,brings about sufferings of other people such as children and nonsmokers,but also causes diseases of
bronchitis,lung cancer,chest cancer and throat catcer.
Smoking is associated with cancers.Smoke is a mixture of gases,vaporized chemicals,minlute particles of ash,and other solids.There are also tar and nicotine,which are
powerful poisons.As the smoke is breathed in,all these components from deposits the
membranes of the lungs.One point Of concentration where air tube,or bronchus divides.Most lung Cancer begins at this point.
World governments should conduct Seriou campaigns against smoking.First,legislative step must be introduced.Second,restrictions on cigarette advertisements must be imposed.Third,public smoking in certain places such as theatres,cinemas,waiting roms at airports and railway stations should be banned.In this way,we may make the smokers feel increasingly uncomfortable about their bad habits.finally,cigarette price should be booste
2014英语四级听力练习慢速4.3(1)
2014英语四级听力练习慢速4.4(1)
2014英语四级听力练习慢速4.7(3)
2014英语四级听力必考习语(一)
2014英语四级听力练习慢速4.9(2)
2014英语四级听力练习慢速4.8(1)
2014英语四级听力练习慢速4.11(2)
2014英语四级听力练习慢速4.4(3)
2014英语四级听力练习慢速4.2(2)
大学英语四级攻略之听力篇
2014英语四级听力练习慢速4.7(1)
2014英语四级听力练习慢速3.27(1)
2014英语四级听力场景解析吃饭场景
英语四级听力训练技巧
2014英语四级听力练习慢速4.5(1)
2014英语四级听力练习慢速4.1(2)
2014英语四级听力练习慢速4.4(2)
2014英语四级听力练习慢速4.8(2)
2014英语四级听力场景解析交通场景
2014英语四级听力场景解析疾病场景
2014英语四级听力练习慢速4.20(2)
英语四级短文听力常见题型及注意事项
2014英语四级听力备考要点
2014英语四级听力练习慢速4.5(2)
2014英语四级听力练习慢速4.16(2)
2014英语四级听力练习慢速4.15(1)
2014英语四级听力练习慢速4.2(1)
2014英语四级听力备考四建议
2014英语四级听力练习慢速4.12(2)
2014英语四级听力练习慢速4.8(3)
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