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托福综合写作满分作文:加氟自来水

2015-04-29 10:03:39来源:网络

  托福综合写作托福考试题中的重难点,一些精彩的满分范文需要同学们多多参考和关注。新东方在线托福网为大家带来托福综合写作满分作文:加氟自来水,希望对大家托福备考有所帮助,更多精彩尽请关注新东方在线托福网!

  托福综合写作满分作文:

  加氟自来水(adding fluoride in public water)

  reading

  在自来水中加氟的好处

  1.防止蛀牙

  2.杀死细菌

  3.对骨骼有好处(decrease bone diseases)

  lecture

  反驳

  1.自来水并不会留在口中,对防止蛀牙没有帮助

  2.氟会与输水管(water pipe)中的化学物质反应,产生有毒物质,其危害大于细菌

  3.过量的氟会使骨骼变脆

  托福综合写作满分作文例文:

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.

  查看全部:托福综合写作满分作文汇总整理

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