2．What do we know about the gray matter?

　　A．The quantity of it has a decisive influence on the cognitive ability.

　　B．It's something in the muscle that develops from physical activity.

　　C．It's a brain disease that will damage the cognitive ability.

　　D．It's some brain matter that can cure brain diseases.

　　答案　A　[细节理解题。从文章最后三段可知，体力运动较积极的人脑部的gray matter较多，可推断gray matter的数量可显示认知能力水平。]

　　3．Which of the following is closest in meaning to the underlined word “shrinking” in Para.9?

　　A．worrying

　　B．weakening

　　C．widening

　　D．wandering

　　答案　B　[词义猜测题。根据文意可知，walking可防止脑部萎缩，功能退化，与答案B(weakening)最相近。]

　　4．What is TRUE about the research?

　　A．Men and women differ in the decline of cognition.

　　B．The research subjects were required to walk blocks per week.

　　C．The findings suggest the more walking，the better health.

　　D．There were about 200 women involved in the research.

　　答案　D　[正误判断题。从文中第四、五段可知，测试对象约300人，其中约2/3为女性。]

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