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  3. Brushing and flossing can surely keep your teeth and gums healthy. Young people are more likely to have tooth decay while older

Brushing and flossing can surely keep your teeth and gums healthy. Young people are more likely to have tooth decay while older

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问题 Brushing and flossing can surely keep your teeth and gums healthy.
Young people are more likely to have tooth decay while older people are at a greater risk for ______.
选项
答案root caries
解析 定位到文章中More Dental Problems标题下的第二句：Children are the most cavity prone，but adults of all ages can be affected，too．In fact，two out of three cavities in people over 50 are a result of  decay around existing fillings，and most people over 60 have root caries as a result of gum diseases．(儿童最容易长蛀牙洞，但是任何年龄的成年人也不例外。事实上，在五十岁以上的人中，三个蛀牙洞中有两个是在已经填补过的牙洞周围腐蚀的，而且大多数60岁以上的人由于牙龈疾病而容易患牙根蛀牙。)题干中的more likely to是对原文中prone的解释。题干是对原文意思的概括。
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