可作为对一种单细胞生物进行分类的依据是[]A．核膜的有无B．核糖体的有无C．细胞壁的有无D．膜上载体蛋白的有无-高一生物

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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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