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.
2011雅思听力:三类考生备考策略全指导
雅思备考:雅思成绩渐成职场敲门砖
高分学生分享:雅思双八经验
专家提醒:雅思备考要有针对性的训练
名师指导:雅思听力练习注意语速语调
名师解读雅思阅读加分法宝:快速阅读
名师指导:雅思阅读提升成绩应从两方面入手
2011年4月2日雅思作文真题第一时间评析
雅思报考升温 六月前名额已满
雅思备考:如何在阅读中借鉴写作思路
如何备战雅思阅读:大量阅读各种材料
如何备考雅思阅读部分:清晰把握文章思路
雅思考试高分经验谈:教你如何打动考官
名师指点雅思阅读兵法:符号有玄机
2011雅思口语考试:趋势策略全指导
名师提示:雅思目标六分考场策略
名师提醒:雅思考试谨防老题陷阱
备考雅思名师观点:能力比技巧更重要
克服雅思阅读的时间障碍:掌握答题技巧
雅思专家点拨:口语培养兴趣点至关重要
名师细谈:2011雅思听力备考最全方法
雅思考试听力那些事儿:练习注意语速语调
雅思听力巧做单选题:做到既保值又保量
雅思写作四大用词方法教你得高分
2011雅思备考:如何与老外对话以提高口语
专家总结:雅思大作文写作的低分原因
雅思口语备考:2011年看我怎么成功
名师教你如何看透剑桥雅思七
2011年5月雅思口语专家预测
轻松拿下雅思阅读七分:系统制定学习计划
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |