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  3. It is a known fact that physical activity improves overall health. Not only does it improve circulation, increase blood flow to

It is a known fact that physical activity improves overall health. Not only does it improve circulation, increase blood flow to

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问题     It is a known fact that physical activity improves overall health.
Not only does it improve circulation, increase blood flow to the
brain, and raise endorphin levels, which both help to reduce stress,【S1】______
improve mood and attitude, and calm children, physically active
students may also achieve more academically. Physically fit students
are more likely to miss school, partake in risky behaviors, get【S2】______
pregnant, or attempt suicide, which all associated with better【S3】______
outcomes in school.
    Many studies have demonstrated the positive effects of physical
education and physical activity on school performance. Several
studies have stated that providing increased time to physical activity【S4】______
can lead to better concentration, reduced disruptive behaviors and
higher test scores in reading, math and writing.
    One specific study that addressed this issue was done by Sallis
et al. when they implemented a program called Project SPARK in【S5】______
which provides physical activity during class by containing health-【S6】______
fitness activities like jump rope and aerobic dance so well as sport-【S7】______
fitness activities like soccer and Frisbee games and focuses on
training teachers to implement the curriculum. The program also
promotes physical activity outside of school and rewards children in【S8】______
engaging in physical activity with their families. Results of the study
show that when teachers were trained to use Project SPARK there
were significant differences between the experimental and control
groups in language, reading, and basic battery. This study shows
that organizing physical education programs can impact student【S9】______
performance even though in short term experiments.【S10】______
【S1】
选项
答案both—all
解析 代词误用。该句意思是“体育锻炼不仅能促进血液循环，增加流入大脑的血流量，而且能提升脑内啡水平，所有这些都有助于减轻压力……。”both表示“两者都”，而这里指的是“三者都”，应该用all，故将both改为all。
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