2. 外语
  3. Brushing and flossing can surely keep your teeth and gums healthy. Receding gums is often the result of hard tooth brushing.

Brushing and flossing can surely keep your teeth and gums healthy. Receding gums is often the result of hard tooth brushing.

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问题 Brushing and flossing can surely keep your teeth and gums healthy.
Receding gums is often the result of hard tooth brushing.
选项 A、Y
B、N
C、NG
答案A
解析 定位到文章标题Tips on Proper Brushing下第一条建议末句：Brushing too hard can cause receding gums，tooth sensitivity．and，over time，loose teeth．(刷牙时用力过猛会造成牙龈萎缩，牙齿过敏，而且久而久之会造成牙齿脱落。)由此可判断，牙龈萎缩常常是由于刷牙过猛造成的。题干与原文内容相符合。
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大学英语六级

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