植物茎的结构中，具有输导功能的是（）A．木纤维B．韧皮纤维C．形成层D．导管和筛管-生物

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• Putting a candle in the window _____a traditional practice in many cultures, _____has a variety of m
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• Between the two parts of the concert is an interval，________ the audience can buy icecream.[ ]A．when
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