题目

No matter how clever a computer becomes, it can never         of humans, because it has to with artificial intelligence, which is made by us humans. A．take place                     B．instead of               C．take the place         D．substitute 答案：C 同位素标记法是生物学上常用的实验方法，小麦根尖分生区细胞中能够被3H—胸苷标记的细胞结构有 （    ） A．染色体和线粒体   B．线粒体和叶绿体   C．叶绿体和染色体   D．线粒体和核糖体