19世纪30年代创立的细胞学说的最主要的意义是[]A．证明病毒不具有细胞结构B．使人们对生物体的结构认识进入微观领域C．证明生物之间存在亲缘关系D．发现动植物细胞的不同之处-高一生物

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• — How was the journey? — Tiring! I caught the train at the last second but all the seats _____. I st
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• Experiments of this kind ________ in both the U. S. and Europe well before the Second World War.[ ]A
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