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Sitting for more than three hours a day can decrease a person's life expectancy（寿命）by two years, even if he or she is physically active and gets rid of dangerous habits like smoking, according to a study．Watching TV for more than two hours a day can worsen that problem, decreasing life expectancy by another l．4 years．
The analysis comes just two years after Australian researchers found that people who said they watched TV for more than four hours a day were 46% more likely to die of any cause than people who said they spent less than two hours a day watching TV．Those watching TV more than four hours a day were also 80% more likely to die of cardiovascular （心血管的） disease．"Sedentary （久坐的） behavior is something we need to pay attention to, beyond telling people to get 30 minutes of activity a day ,”said Peter T．Katzmaezyk． one of' the lead researchers． But while the evidence of illnesses is increasing, it remains difficult for many people to find time to get on their feet, especially if they do desk jobs．
"Try to stand as much as you can," Dr．Katzmarzyk said．"Typically when you're on the telephone you can stand and use the speakerphone Instead of emailing someone in the office, just get up and So to talk to them．" However, Dr．Katzmarzyk added, standing shouldn't be an alternative to exercising, but an alternative to sitting．"Several studies show that when you're sitting, your leg muscles are completely inactive," he said． "When you're sitting and completely inactive, this is when you run into trouble managing blood glucose （血糖）．"
29．What is the main idea of the first paragraph?
A．Watching TV too long can worsen our mental health．
B．We should he active and give up smoking．
C．Silting for too long a time can shorten one's lire．
D．Smoking too much can be harmful to health．
30．The researchers draw the conclusion on the effect of sedentary behavior by ．
A．making comparisons B．istin8 figures
C．giving examples D．classifying facts
31．What dues Dr．Katzmarzyk think of sedentary behavior?
A．It warns people to exercise 30 minutes a day．
B．It's a bad behavior worth considering seriously．
C．Sedentary behavior can lead to death at once．
D．Sedentary behavior is good for desk job workers．
32．According to Dr．Katzmarzyk, if you are sitting all the time, you may _ ．
A．phone your friends and talk about your problem
B．put on weight quickly and become more inactive
C．want to have more sugar for your meals
D．fincl it hard to keep your blood glucose proper
D
New Zealand has long been mountain hike mad． Over the last 25 years an increasing number of dedicated（专用）cycle tracks and parks have sprung up in both town and country, many developed by bike clubs and other community groups．
Recreational cycling was already on a roll, when in 2009 a 50 million New Zealand dollar government fund was established to create a continuous touring route running the length of the country, supported al a grass roots level by an additional 50 million New Zealand dollars offered up by councils and focal organizations．
It soon became apparent, however, that building one continuous route across the two islands was not only too ambitious, hut it also would bypass many of the most remote and interesting corners of the country． Restoring and extending historic pathways made more sense, enabling cyclists to visit fascinating historic and cultural sites while seeing natural wonders along the way, and inspiring both locals and people from overseas to ride them．
The first sod （草皮） of the new trails was turned by Prime Minister John Key in late 2（X）9． Since then, armed will machetes, shovels and diggers, some of the world's hest single-track designers and builders have bush-bashed, benched． sidled and switch-hacked their way through a diverse range of terrain （地形）．
By the encl of 2012, 10 0f the 20 trails were open to riders, with the remainder scheduled for completion by the end of 2,013．The 2,340 km network will be even further extended by already-established trails, such as the famous 71 km Queen Charlotte Track that goes through the Marlborough Sounds al the top of the South Island．
33．Restoring and extending historic pathways would _ ．
A．work natural wonders alone the historic pathways
B．allow cyclists to enjoy local history and culture
C．discourage locals and foreigners from riding them
D．avoid all remote and interesting corners of the country
34．Who first started the building work of the new trails?
A．Prime Minister John Key．
B．Locals and people from overseas．
C．Some of the single-track designers．
D．Bike clubs and other community groups．
35．What can be the best title for the text?
A．Mountain Bike Holiday． B．Recreational Cycling．
C．New Cycle Trails for Easy Riding． D．Queen Charlotte Track．
