为什么有的同学看到作文题就皱着眉头，苦思冥想写不出来?道理很简单，因为不善于观察生活和积累素材。威廉希尔app 为广大考生朋友收集精选了一些作文材料，这篇初中生暑假英语作文500字希望对大家的学习有所帮助!

初中生暑假英语作文500字：Controlling Cancer

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.

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