5．The human body is designed to move．But modern lifestyles and office jobs rarely give us the chance to move around．As we know，we're while we're eating； we sit in the car and we sit while we watch TV．And many of us sit for many hours at work．
New research shows that sitting less than three hours a day might extend your life by two years．Peter Katzmarzyk，a scientist at the University of Louisiana in the southern United States，says that sitting is ubiquitous in our lives，meaning it is something we do all the time，everywhere．
However，Mr．Katzmarzyk says that does not mean you can sit for the rest of your waking hours．He also says you may exercise often，"We can't throw away physical activity．It's extremely important．We have 60years of research showing us that．"
Mr．Katzmarzyk and his colleagues are part of a new generation of researchers studying how sitting all day affects length of life．"Studies that have assessed the relationship between sitting and mortality（死亡率）or television viewing and mortality are very rare．There's only been a few of them，actually five or six now，in the last four or five years．"They found that cutting television time to less than two hours a day could add one-point four years to life．
Luckily，change is already coming to some offices，especially in the design of desks．A"standing desk"lets people stand while they work．Another new design is called the"treadmill desk．"A treadmill is an exercise machine that lets you walk in one place．Even some U．S．schools are beginning to experiment with desks that are part bicycle to keep children moving．That's one of the strategies that many companies are using now．
Mr．Katzmarzyk also says studying this problem has inspired his team to make a few changes in their own lives．
28．The underlined word"ubiquitous"is closest in meaning toD．
A．dangerous
B．awkward
C．comfortable
D．common
29．Which view agrees with the opinion of Mr．Katzmarzyk？B
A．Sitting too long may help increase one's life．
B．Exercise is important and don't sit too long．
C．Watching TV is bad，but can broaden one's horizons．
D．Stopping watching TV is a necessary but hard task．
30．What does Mr．Katzmarzyk think of his study in Paragraph 4？A
A．It's a relatively new area of study．
B．It's a hot subject studied by experts．
C．It's a study that begins too late．
D．It's not ignored by many experts．
31．Why are the desks of all kinds designed for those who sit more？C
A．To give them more comfort．
B．To improve their work efficiency．
C．To offer them the chance to exercise．
D．To seek pleasure while working．
分析 本文是一篇科教类阅读，属于科普文．文章主要讲述了坐着的坏处，以及给了读者如何减少坐着时间的几点建议，告知读者坐的越少活得越久，少坐可以延长我们的生命．
解答 28．D．词义猜测题．根据画线单词后的内容it is something we do all the time，everywhere知我们随时随地都坐着，因此ubiquitous的意思是"常见的"，故最佳答案为D．
29．B．细节理解题．根据第三段中的We can't throw away physical activity．It's extremely important．（我们不能扔掉体育活动．它非常重要．）知选项B（锻炼很重要，不能长时间坐着）意思是一致的，故最佳答案为B．
30．A．推理判断题．根据第四段中的There's only been a few of them，actually five or six now，in the last four or five years知他的研究是相对较新的，故最佳答案为A．
31．C．推理判断题．根据倒数第二段中的内容，办公桌的设计已经发生变化了，其目的是要久坐的人多运动，故最佳答案为C．
点评 考查学生的细节理解和推理判断能力．做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确选择．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
