These high rates of inactivity are worrying. Human beings seem to have evolved(进化) to benefit from exercise while deliberately avoiding it whenever they can. In a state of nature it would be impossible to live a life that did not provide enough of it. But that is no longer the case. Actually lack of enough activity these days has nearly the same effect on life span(寿命) as smoking.

　　21. We may learn from Paragraph 1 that_________.

　　A. the decline of exercise rates is newly discovered

　　B. the study suggests 31% of female adults get too little exercise

　　C. the good enough data has been collected from only one country

　　D. the industrial revolution has changed the way people live to some degree

　　22. According to the study, women of Luxembourg_________.

　　A. have little time to exercise

　　B. hate to get regular exercise

　　C. take more exercise to lose weight

　　D. exercise more than men in their country

　　23. The underlined word “slothful” in Paragraph 3 most probably means_________.

　　A. powerful

　　B. rich

　　C. lazy

　　D. unpopular

　　24. What can be the best title for the text?

　　A. Worldwide Lack of Enough Exercise

　　B. New Health Discovery

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