皮皮学，免费搜题
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【单选题】
高钙低锌促使猪缺乏( ),产生皮肤不完全角化症。A.
锌
B.
碘
C.
锰
D.
铁
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【单选题】A It was the first snow of winter – an exciting day for every child but not for most teachers. Up until now, I had been old enough to dress myself, but today I would need some help. Miss Finlayson, my...
A.
trousers
B.
jacket
C.
boots
D.
hat
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