题目

下列有关原核细胞与真核细胞的叙述中，错误的是  A．蓝藻和水绵细胞中都含有核糖体 B．它们都有染色体，存在DNA C．最大的区别是原核细胞没有核膜包围的典型细胞核 D．原核细胞的细胞膜化学组成和结构与真核细胞相似 答案：B —Could you tell me______ at this time yesterday?—Oh, I was watching TV.A.when you were goingB.where you were goingC.what you were doing