“23.________This ‘New PE.’ expands the kinds of sports that are taught.But activities that some schools offer now, like rock climbing walls and skateboarding, can also expand the risks, ”says Cheryl Richardson.She is with the National Association for Sport and Physical Education.Also, she says not all states require PE teachers to be specially trained.24.________

　　Cheryl Richardson also points out one of the study's findings that injuries are often result of contact with a person or a structure.This tells her that the teachers might not give each student enough space to move around safely.

　　Six activities produce 70% of all injuries: running, basketball, football, volleyball, soccer and gymnastics.

　　The study appeared online this week in Pediatrics, the journal of the American of Pediatrics.

　　25．________Larger classes can mean less supervision.The National Association for Sport and Physical Education says twenty to thirty students in a PE class should be the limit.

　　A．The researchers say larger class sizes are another possible reason for the increase in injuries.

　　B．Another possible reason for more injuries is a change in the traditional idea of physical education.

　　C．Almost onefifth of American children and teenagers are overweight.

　　D．The government has passed laws as a guide for the weight problem.

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