题目

My grandmother is eighty years old, but she is very healthy. She lived in the countryside by herself before. 【1】. She lived in a small house, and she grew many vegetables in front of it. She was very friendly and she often gave some vegetables to her neighbors, she liked living in the countryside. 【2】.She liked her life in the countryside. Now she comes to the city and lives with us.【3】. She likes to have an early breakfast: rice ,vegetables and an egg. 【4】. She does this every day. All the people in the street knows her. Children in the neighborhood all love her, because she i为探究牛奶变质的原因，某同学完成如下实验与试管①相比，试管②中牛奶未发生变质，这是由于微生物被阻挡在（　　）A. 牛奶内部 B. 试管管口C. 棉花塞内部 D. 玻璃管拐弯处