Peter Schnohr，a researcher in Copenhagen，said, “If your goal is to decrease risk of death and improve life expectancy，jogging a few times a week at a moderate pace is a good strategy.Anything more is not just unnecessary，and it may be harmful.”

　　The implications of this are that moderate forms of exercise such as tai chi，yoga and brisk walking may be better for us than “iron man” events，triathlons and long­distance running and cycling.According to Jacob Louis Marott，another researcher involved in the study，“You don’t actually have to do that much to have a good impact on your health.And perhaps you shouldn’t actually do too much.”

　　1．The underlined word “strenuous” in Paragraph 1 is closest in meaning to “

　　”．

　　A．hard

　　B．regular

　　C．practical

　　D．flexible

　　2．The author presents some figures in Paragraph 2 to

　　.

　　A．suggest giving up jogging

　　B．show risks of doing sports

　　C．provide supportive evidence

　　D．introduce the research process

　　3．According to the scientists，why is too much exercise harmful?

　　A．It may injure the heart and arteries.

　　B．It can make the body tired out.

　　C．It will bring much pressure.

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