【題目】At the moment, Mr White is doing an to show students why it’s important to clean teeth.

A.experimentB.operationC.instrumentD.invention

【答案】A

【解析】

句意： 那時(shí)，懷特先生正在做一個實(shí)驗(yàn)，展示給學(xué)生清潔牙齒為什么那么重要。

本題考查名詞辨析。experiment意為“實(shí)驗(yàn)”，operation 意為“手術(shù)，操作”；instrument意為“儀器”；invention意為“發(fā)明”。由to show students why it’s important to clean teeth.可知，要給學(xué)生展示為什么清潔牙齒那么重要，這是做實(shí)驗(yàn)，故選A。

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