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 bacterial______.

选项 A、flourish
B、collaborate
C、embark
D、congregate

答案D

解析 选项A为“昌盛,旺盛,兴旺”;选项B为“(与某人)合作,访作”;选项C为“登船,上船,登机”;选项D为“聚集,集合,堆积”。观察but后面的内容,强调了“牙医建议大家在刷牙的时候也要刷舌头”这样一个事实。根据常识我们可以推断,既然刷牙要刷舌头,就说明舌头的某一部位堆积或者聚集了大量的细菌。故选D。
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