A
Maybe you think there are many reasons why you are over weighed? Recent research compare the sedentary（久坐的） behavior to smoking, warning it could reduce years from your lifespan. Now, researchers at the University of Texas, have added their weight to the argument. They found standing for up to six hours a day, can cut fat levels by a third.
Being upright, rather than slumped(消沉) at your desk, in front of the TV or on the train to work, for one quarter of the day is linked to a 32 percent decrease in the chance of becoming obese（肥胖的）.
They found that among men, standing a quarter of the time was linked to a 32 percent reduced likelihood of obesity (body fat percentage). Standing half the time was associated with a 59 percent reduced likelihood of obesity. But standing more than three-quarters of the time was not associated with a lower risk of obesity.
In women, standing a quarter, half, and three quarters of the time was associated with 35 percent, 47 percent, and 57 percent respective reductions in the likelihood of waist size. The US scientists looked at the standing habits of more than 7,000 adults and compared their body mass index (BMI), body fat percentage and waist size.
21. According to the passage, standing up six hours a day could _______.
A. make you over weighed. B. even worse than smoking
C. reduce years of your lifespan. D. cut your fat levels
【答案】：D
22. Slumping at a desk or in from of a TV is very likely to ________.
A. reduce likelihood of obesity. B. reduce the body fat percentage.
C. increase the chance of becoming obese D. makes no difference to one’s weight
【答案】：C
23. What might be the main idea of the passage?
A. Standing is a good way to lose weight. B. Women has a longer lifespan.
C. Are you suffering from obesity? D. Smoking do more harm to body.
【答案】：A
【解析】：本文考查对文章大意的把握。从第一段从后一句可知，文章主要在讲站立对减肥的作用。
