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Children these days ________ their parents too much. They should learn to look after themselves.
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After _______, she arrived_______ a small village.
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Hi, Jim. I phoned you at 5 o'clock yesterday afternoon. But nobody answered. 小题1: ?
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将氢氧化铜样品(杂质不含铜元素也不参加反应)与碳单质的混合物63.6g隔绝空气加热到900℃
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