题目

  42. The radio set __  _ last week has been out of order. A. I bought      B. I bought it       C. which I bought it          D. what I bought 答案：A11．与人体的细胞相比，小麦的表皮细胞特有的结构有（　　）①细胞壁 ②细胞膜③叶绿体④线粒体⑤细胞核⑥中央大液泡⑦细胞质．A．①⑥B．②③⑤⑦C．①③⑥D．①③⑥⑦