皮皮学，免费搜题
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搜题
【单选题】
When Mary discovered how treacherous the streets could be, she demanded that her boys stay close to her in the church gym and youth center, and the boys were as good as gold , listening to every word she said.A.
very naughty
B.
very obedient
C.
faithful
D.
patient
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皮皮学刷刷变学霸
举一反三
【简答题】必需微量元素中()、()、()为容易缺乏的微量营养素。
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