There are two main causes of cancer: heredity and environment. We can do nothing to change our heredity, that is, the basic physical characteristics that were passed on to us by our parents. However, we can do a GREat deal to control our environment, which may account for 80-90 %of all cancers.
Environmental pollution can be divided into two kinds: personal and impersonal. Personal pollution may be defined roughly as unhealthy habits such as smoking, drinking, and eating the wrong foods. Clearly, with enough will power we can control this personal environment.
Impersonal pollution, on the other hand, refers to those things which are beyond our individual control. One example would be industrial pollution, which is very hard to control because of the expense involved. It would be expensive in terms of profits and perhaps jobs. The American automobile industry, for example, resisted the law requiring smog-control devices because it feared the added expense would reduce profits. Nevertheless, some laws protecting the environment have been quite successful in reducing pollution.
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破七、时态和语态
2016届高考英语名校试题汇编(精练+解析)专题07时态和语态(学生版)
2016高考英语一轮复习(福建泉州专用)北师大版选修八《Unit22》强化演练知能闯关
湖北省监利一中2016届高三英语单词竞赛试题(九)
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第十一节—语法专练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版选修七《Unit20》强化演练知能闯关
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破五
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破六、情态动词和虚拟语气
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破四、动词和动词短语
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破十、状语从句
2016高考英语北师大版必修1一轮复习课件(安徽专用)《Unit 2 Heroes》英雄
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第七节—语法专练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第一节—语法专练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版选修六《Unit16》强化演练知能闯关
2016高考英语一轮课件优化复习(山东专用)人教版:专项提能计划——书面表达(八)
2016高考英语一轮复习(福建泉州专用)北师大版必修一《Unit1》强化演练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版必修五《Unit14》强化演练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版选修七《Unit21》强化演练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版选修八《Unit23》强化演练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版必修一《Unit3》强化演练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第五节—语法专练知能闯关
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破1、代词
2016高考英语一轮复习(福建泉州专用)北师大版选修七《Unit19》强化演练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版语法突破:第九节—语法专练知能闯关
2016高考英语一轮复习(福建泉州专用)北师大版必修五《Unit13》强化演练知能闯关
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破2、名词、冠词
2016高考英语一轮复习(福建泉州专用)北师大版选修八《Unit24》强化演练知能闯关
2016届高考英语一轮高频考点探究4 Units4
2016高考英语一轮课件优化复习(山东专用)人教版:语法专项突破十一、特殊句式
2016高考英语北师大版必修1一轮复习课件(安徽专用)《Unit 1 Lifestyles》生活方式
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