题目

  2. Zhou Yang of China won____women's 1500 meters short track speed skating gold medal at  ________Vancouver Olympic Winter Games on Saturday.   A. a ,the                          B. the ,the          C. /  ,the             D. the ,/ 答案：B与植物细胞相比，动物细胞不具有的结构是 （ ）①细胞壁 ②细胞膜 ③细胞质 ④叶绿体 ⑤细胞核A. ①③ B. ②③ C. ①④ D. ②⑤