[img]2012q2/ct_eyyjsdz2006b_eyyjsdreadc_0773_20121[/img] [br] What causes gum di

游客2024-08-23 31

问题

[br] What causes gum disease?______

选项

答案 Plaque causes gum disease．／Plaque．

解析 (文章第一句话就指出Gum disease is caused by plaque．)

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