While I _ a Zhengjian Evening Paper inthe sitting room, the doorbell rang.[ ]A.was readingB.readC.is

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• The pupils hurried to the classroom _____ the bell rang.[ ]A. until B. as soon as C. if D. so that-八
• 如图所示的四种单细胞生物在结构上既有相同之处也有不同之处，它们都能在各自的环境中独立存在．（1）A、B都属于菌类，A在细胞结构上与B最主要的区别是．（2）C属于植物，因为其细-八年级生物
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• 生物兴趣小组的同学在培养草履虫时发现，草履虫常集中在培养液的表层，原因是培养液的表层A．氧气充足B．阳光充足C．营养丰富D．温暖-七年级生物
• 下列属于单细胞真核生物的是（）A．青霉B．蘑菇C．酵母菌D．噬菌体-八年级生物
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