The skin is the largest organ of your body&

The skin is the largest organ of your body ______of three layers;______are essential to ______your body against
diseases, poisons and the sun’s harmful rays or radiations.A.consisting; they; protectingB.consisting; which; protectingC.made up of; they; protectD.consisted; they; protecting

A解析试题分析：考查consisting 和consisted的用法，consisting of意思“由……组成”，相当于一个介词短语，consisted of表示被动，made up of意思“构成”，be essential to固定词组，意思“对……必要的”， to是介词，后跟名词和动名词和名词性短语，所以选A
考点：考查consisting 和consisted的用法
点评：遇到此类题要小心审题，consisting of修饰前面的名词your body，意思“由三层组成的身体”。

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