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19．How Much Exercise Do I Need？
When it comes to exercise，less is not more-but it's certainly better than none．Physical inactivity accounts for as many as 23percent of all deaths from major chronic （慢性的） diseases，yet almost one of every three Americans is sedentary （spending a lot of time sitting down）．According to the Centers for Disease Control，29.4percent of those surveyed （調查） report they have no free-time physical activity at all．City people tend to be more active than country folks，with 27.4percent saying they are sedentary，compared with 36.6percent of those in rural areas．
Light activity can improve physical and mental well-being．While light activity is good，moderate （not very large or very small） activity is even better，and health experts encourage everyone to have at least 30minutes a day of moderate physical activity．But you don't have to head to a gym．As recent studies have confirmed，"lifestyle"activities，such as walking，house cleaning and gardening，are as effective as a structured exercise program in improving heart function，lowering blood pressure and keeping or losing weight．
In one study，overweight，sedentary middle-aged men and women who learned behavioral skills to make them more physically active，such as walking around airports or train stations while waiting for a departure，reduced their body fat percentage and improved their blood pressure and heart function as much as individuals participating in structured programs at a fitness center．In another study，fat women ranging in age from 21to 60who adopted a more active lifestyle lost as much weight as women in a low-impact aerobics （有氧健身） program-and regained fewer pounds in the following year．
Recognizing the value of different levels and types of activity，the American College of Sports Medicine has changed its recommendations on quantity and quality of exercise to include flexibility as well as aerobic and muscle exercise and to acknowledge that multiple short periods of exercise during the day are nearly as beneficial as one long session．

63．By saying that almost one third of Americans are sedentary，the author meansD．
A．they take proper exercise to be healthy
B．they know nothing about light activity
C．they are very fond of physical activity
D．they take little free-time physical activity
64．We can learn from the passage thatD．
A．light activity is especially good for the middle-aged people
B．people like light activity because it won't make them feel tired
C．people only need to do light activity three times a week to keep fit
D．light activity promotes people's well-being physically and mentally
65．What do health experts suggest about moderate activity？A
A．No less than half an hour's moderate activity daily can do us good．
B．Moderate activity is no better than light activity to people．
C．"Lifestyle"activities don't belong to moderate activity．
D．People may go to the gym to take moderate activity．
66．According to the passage，which of the following belongs to a structured exercise program？A
A．Doing gymnastics at a gym． B．Taking outdoor activities．
C．Walking．                   D．Gardening．

分析 本文屬于說明文閱讀，作者通過這篇文章向我們介紹了我們每天應該做多少鍛煉，研究表明久坐的人會增加患病的幾率，因此專家建議我們每天都要做輕微的運動，最好每天做不少于三十分鐘的適度運動．

解答 63．D  推理判斷題，根據(jù)第一段Physical inactivity accounts for as many as 23percent of all deaths from major chronic （慢性的） diseases，yet almost one of every three Americans is sedentary （spending a lot of time sitting down）．可知幾乎有三分之一的美國人是久坐不動的，這說明他們很少有空閑時間的體力活動，故選D．
64．D  細節(jié)理解題，根據(jù)第二段Light activity can improve physical and mental well-being．While light activity is good，moderate （not very large or very small） activity is even better，and health experts encourage everyone to have at least 30minutes a day of moderate physical activity．可知輕微活動能促進人的身心健康，故選D．
65．A  細節(jié)理解題，根據(jù)第二段and health experts encourage everyone to have at least 30minutes a day of moderate physical activity．But you don't have to head to a gym．可知健康專家建議每天做30分鐘的適度活動，故選A．
66．A  推理判斷題，根據(jù)第二段As recent studies have confirmed，"lifestyle"activities，such as walking，house cleaning and gardening，are as effective as a structured exercise program in improving heart function，lowering blood pressure and keeping or losing weight．可知結構化的運動計劃包括散步，清潔房子和園藝，由此推知在健身房做體操也屬于結構化的運動計劃，故選A．

點評 考查學生的細節(jié)理解和推理判斷能力．做細節(jié)理解題時一定要找到文章中的原句，和題干進行比較，再做出正確選擇．在做推理判斷題時不要以個人的主觀想象代替文章的事實，要根據(jù)文章事實進行合乎邏輯的推理判斷．

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