Skinis primarily made of two layers: the uppermost layer, the epidermis, which _-组卷网

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Skin is primarily made of two layers: the uppermost layer, the epidermis, which ________ a protection against the environment; and the dermis, the layer below the epidermis.

A．is being served as

B．serves as

C．has served as

D．is served as

23-24高一上·上海·期中

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A．is being served as

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