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【判断题】
玉米从雌雄同株转变为雌雄异株,是基因突变的结果。
A.
正确
B.
错误
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参考解析：
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【简答题】消费品市场的特点是什么
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【单选题】消费品市场的特点是（      ）
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【单选题】消费品市场的特点是( )。
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【单选题】Hardly ____ into the country ____ it began to rain.
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