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    【题目】The three layers of skin act as a barrier against diseases, poisons and the sun's (射线).

    【答案】rays
    【解析】rays.考查名词。句意：皮肤的三层是抵抗疾病、毒物和太阳射线的屏障。“射线”是可数名词要用复数，故填rays.

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