题目

 — How was your weekend? — It was ________. I had lots of fun. A. terrible             B. tiring                C. bad                         D. wonderful 答案：D15．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细胞核  ⑤液泡  ⑥叶绿体．A．①②③B．④⑤⑥C．②③④D．①⑤⑥