52
45
48
32
33
29
41
46
44
24
38
39
37
49
53
36
43
某校三(一)班学生参加户外活动“收集矿泉水瓶”个数统计图
收集个数/个
21~30
31~40
41~50
51~60
人数/人
2
7
13
——Do you think Peter is free today?
——__________. He is really busy preparing(准备) for the coming test these days.