题目

按要求改写句子。1. I can hear some animals. (对画线部分提问)__________________________________2. They like grass. (对画线部分提问)___________________________________3. Open the door. (变否定句)__________________________________4. This is my pig. (变复数)__________________________________5. I can hear some cows. (变否定句)________________________________ 答案：【答案】1. What can you hear? 2. What do they like? 3. Don’t open the door. 4. These are my pigs. 5. I can’t hear any cows. 【解析】略下列实验操作中，错误的是（　　）A. 滴加液体 B. 加热液体 C. 稀释浓硫酸 D. 检查气密性