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    A recent research shows that physical activity(体育活动) may help students do better in their classes. The research comes because educators in some countries are reducing time for activities like P.E. class.
    Researchers go over the results of fourteen studies. Twelve were from the United States, one from Canada and one from South Africa. The studies appeared between 2009 and 2013. They included more than 55,000 children, aged six to eighteen.
    Thomas Singh, one of the researchers, says the studies showed a relationship between physical activity and scores on subjects such as math, English and reading. Ms. Singh offers some possible explanations (解释):
    “ There are, first, physiological (生理的) explanations, like more blood flow, and so more oxygen (氧气) to the brain. Being physically active means there are more hormones（ 荷尔蒙） produced like endorphins ( 脑内啡). And endorphins make your stress level lower and your mood improved, which means you will perform better in class. Also, students who take part in organized sports learn rules and how to follow them. This could improve their classroom behavior and help them know what they should do.
    All in all, the finding tells us that physically active kids are more likely to do better in school. Ms. Singh says schools should consider the finding before they cut physical education programs. 
    小题1:What led the researchers to do the studies?
    A．Schools’cutting physical activity.
    B．Their interest in physical activity.
    C．The tests including about 55,000 children.
    D．Kids’unsatisfying schooling performance.
    小题2:How many countries took part in the studies?
    A．14. B．12C．2. D．3.
    小题3:Which of the following is NOT one of the advantages of physical activity according to the passage?
    A．Getting more blood flow.
    B．Better classroom behavior.
    C．Feeling relaxed and refreshed.
    D．Greater ability to organize activities.

    小题1:A
    小题2:D
    小题3:C

    试题分析：这篇短文主要介绍了一项关于体育运动对学生在校表现的影响的调查报告。报告中提到了，参加体育活动有助于提高血液循环速度，改善课堂行为和提高学生组织活动的能力。
    小题1:细节理解题。题干意为：是什么让调查者做这项研究？根据短文第一段The research comes because educators in some countries are reducing time for activities like P. E. class.描述，可知是由于一些学校削减活动课，如体育课的课时这件事导致了研究者做的这项研究。故选A。
    小题2:细节理解题。题干意为：多少个国家参与了这项研究？根据Twelve were from the United States，one from Canada and one from South Africa.描述，可知有美国，加拿大和南非三个国家参与了这项研究。故选D。
    小题3:细节理解题。题干意为：根据本文下列哪条不是体育运动的优势之一？根据短文倒数第二段描述，可知参加体育活动有助于提高血液循环速度，改善课堂行为和提高学生组织活动的能力。没有关于体育活动能让人感到放松和神清气爽的描述，故选C。
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