读下面的信，回答后面的问题。 To: Julia@penpal.com From
问题：
读下面的信，回答后面的问题。
To: Julia@penpal.com
From: Liu Ming@penpal.com
Dear Julia,
England must be fun! I live in China with my parents and my little brother. My mom is a nurse. She likes
reading newspapers. My dad is a computer expert. He likes watching TV. My little brother is only 3. He likes
playing with his dolls. I'm a student. I like drawing pictures and collecting stamps.
Your new friend,
Liu Ming
1. What is Liu Ming's hobby?
________________________________________________
2. What is his mother's hobby?
________________________________________________
3. What is his father's hobby?
________________________________________________
4. What is his brother's hobby?
________________________________________________
5. What is his mother?
________________________________________________
采用控制变量法，应保持________不变。
可画出a－F关系图线（如图所示）。
（单选题）此图线的AB段明显偏离直线，造成此误差的主要原因是：
态