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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; protecting

B.consisting; which; protecting

C.made up of; they; protect

D.consisted; they; protecting

高三英语单项填空中等难度题

少年,再来一题如何?
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