[img]2012q2/ct_eyyjsdz2006b_eyyjsdreadc_0773_20121[/img] [br] According to the f

游客2023-10-21 54

问题

[br] According to the first paragraph, can you explain what plaque is?It is an almost______on______.

选项

答案 invisible layer of bacteria deposit；teeth

解析 (文章第一部分第一句话中破折号后面的解释即为什么是plaque。)

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