七 新素材 盐城某小学五(2)班进行了一次“健康习惯”调查统计，结果如下图。请根据统计图信息，选择正确的答案。(每小题5分，共20分)

() 1. How many students exercise for 1 hour every day?
A. 15.
B. 20.
C. 25.
() 2. To keep healthy, what do the students do most often?
A. Eat vegetables every day.
B. Brush teeth twice a day.
C. Go to bed early every day.
() 3. Which healthy habit do the fewest(最少的) students have?
A. Eating vegetables every day.
B. Exercising for 1 hour every day.
C. Brushing teeth twice a day.
() 4. How can 22 students in Class 2, Grade 5 stay healthy?
A. Exercise every day.
B. Go to bed early every day.
C. Eat vegetables every day.

1. B 解析:统计图中"每天运动1小时"对应人数为20。
2. B 解析:"每天刷牙2次"的人数最多(25人),因此这是该班学生最常做的事。
3. A 解析:"每天吃蔬菜"的人数为15,是四项习惯中人数最少的。
4. B 解析:"每天早睡"对应人数为22,与题干数字匹配。