Brushing removes larger particles, but dentists suggest brushing the back of the

游客2025-05-01 45

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”，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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