【寫作范文】托福綜合寫作滿分作文——加氟自來水
托福綜合寫作滿分作文：
氟自來水(adding fluoride in public water)
reading
在自來水中加氟的好處
1.防止蛀牙
2.殺死細菌
3.對骨骼有好處(decrease bone diseases)
lecture
反駁
1.自來水并不會留在口中，對防止蛀牙沒有幫助
2.氟會與輸水管(water pipe)中的化學物質反應，產生有毒物質，其危害大于細菌
3.過量的氟會使骨骼變脆
托福綜合寫作滿分作文例文：
The speaker refutes the reading's argument about the benefits of adding fluoride to pipe water by providing contradictory evidence about
pipe water's fluoride's effectiveness in preventing cavities in teeth, killing bacteria, and decreasing bone diseases.
Firstly, the speaker points out that the short contact of fluoride with teeth will not enable the fluoride to prevent cavities, as the reading argues. Instead, the water will pass the mouth and teeth quickly and go directly to the stomach.
Another argument raised in the lecture is that fluoride could undergo chemical reactions with heavy metals in the pipe, such as lead. This will create toxic substances which will pose serious health threat. In this way fluoride could be even more deadly than bacteria. Although the fluoride, as the reading says, will kill some bacteria, the cure here is worse than the disease.
In the end, the speaker maintains that overdose of fluoride will backfire to human bones. Although the reading illustrates that fluoride will improve bone strength, the lecture says overdose will cause serious damage to human bones.
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