四年级一班有65人，每人买6本作文本，9本作业本，一共买了多少本的正确列式[ ]
A． 65×6+9
B． 6×9×65
C．（6+9）×65
答案：C
自由基是指分子、原子或基团中存在有未配对电子的一类物质，其特点为寿命短，生成后不稳定。()
根据句义和所给首字母完成下列单词。
1. — What's the girl doing?
— She's s_____.
2. — What's the boy doing?
— He's d_____ his homework.
3. — What are you doing?
— I'm d______ tea.
4. — What are they doing?
— They're e______ bananas.
5. — What are Mary and Tom doing?
— They're g______ to school.
