The researchers said they found only two high - quality studies．They called for more high-

　　quality studies to confirm their findings．They also pointed out that “outcomes for other parts of the world may be quite different. ”

　　Still，the general finding was that physically active kids are more likely to do better in school．Ms．Singh says schools should consider that finding before they cut physical education programs．Her paper on “Physical Activity and Performance at School”is published in the Archives of Pediatric and Adolescent Medicine．

　　72．The passage mainly tells us that ＿＿＿＿

　　A．a research on physical education has been done by the researchers

　　B．there exists a possibility that physical activity leads to higher grades

　　C．the amount or kind of activity directly affects academic level

　　D．the research shows that the children aged 6 to 1 8 don't do sports

　　73．Which of the following is TRUE?

　　A．Being mentally active is good for academic subjects．

　　B．The more hormones you have，the more stressed you will get．

　　C．They have found many high-quality studies to prove the research．

　　D．The educators in the research think studies，not exercise，mean much to students．

　　74．The underlined sentence in Paragraph 7 probably means ＿＿＿＿.

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