qq的優點和缺點英語作文
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篇一：英語寫作
1. others viwed the finding with caution, nothing that a caused-and effect relationship between passive smoking and cancer remains to be showen.
2. Smoking is harmful to people’s health. Medical science has now proved that smoking can cause cancer and other disease such as emphysema .your chances of having a heart attack also increase the more of smoke .smoking is definitely a health hazard.
2.in my opinion ,three main factors account for such phenomenon
