2. 外语
  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】______
【S5】
选项
答案when—where
解析 从句引导词错误。该句意思是“在由萨利斯：等人针对解决此问题所做的一项专门的研究中……。”该句中包含一个先行词为study的定语从句，引导词应该用关系副词where，故将when改为where。
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