” the study authors reported.“Increasing awareness regarding health benefits of physical activity beyond weight control might help have a correct idea of physical activity levels and encourage behavior change.”

　　20．According to the Speedy Study

　　what kind of children can be judged physically inactive?

　　A．Slim children.

　　B．Children with less than an hour a day of physical activity.

　　C．Overweight children.

　　D．Children out of

　　touch with their parents for a long time.

　　21．What does the writer probably

　　mean by saying “a sizable minority of children were not” in Paragraph 3?

　　A．The

　　amount of children's physical activity is far from the writer's

　　satisfaction.

　　B．A lot of children were not getting enough physical activity.

　　C．A small number of children didn't overestimate their physical activity.

　　D．The minority of children were not studied at all.

　　22．The passage is intended to________．accelerometers during exercise

　　D．advise parents to keep in touch with their children

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