题目

The dog _______for two months. Its _____ made us very sad. A. has been dead; died                            B.    died; dead C. has been dead; death                          D.    died; death 答案：C若将细胞膜的磷脂分子提取后放入盛水的容器中，磷脂分子稳定的分布方式是（   ）