2. 外语
  3. Brushing and flossing can surely keep your teeth and gums healthy. Flossing, an essential part of the tooth-cleaning process, r

Brushing and flossing can surely keep your teeth and gums healthy. Flossing, an essential part of the tooth-cleaning process, r

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问题 Brushing and flossing can surely keep your teeth and gums healthy.
Flossing, an essential part of the tooth-cleaning process, removes plaque between teeth and at the gumline, the breeding ground for ______.
选项
答案volatile sulfur compounds
解析 定位到Facts on Flossing标题，首段第三句Sometimes，the bacteria break down the food particles and create volatile sulfur compounds．For this reason you’ll need to floss these spaces at least once a day.(有时，细菌分解食物残渣，产生易挥发的硫化合物。因此，你至少需要每天用牙线清洁这些地方。)由此可得出答案。
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大学英语六级

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