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  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 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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