2. 外语
  3. Brushing removes larger particles, but dentists suggest brushing the back of the tongue as well, where food residues and bacteri

Brushing removes larger particles, but dentists suggest brushing the back of the tongue as well, where food residues and bacteri

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问题 Brushing removes larger particles, but dentists suggest brushing the back of the tongue as well, where food residues and bacteria ______ .
选项 A、flourish
B、collaborate
C、embark
D、congregate
答案D
解析 D项“congregate聚集”，如A crowd quickly congregated round the speaker(大群的人迅速地在演说者周围聚集起来)，根据空格处的意思：舌头后面是食物残渣和细菌聚集处，故选D。A项 flourish繁荣；B项collaborate合作；C项embark着手，均不符合题意。
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