Still, in a study published last year that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat more had a higher death risk, independently of whether or not they exercised.

　　"We don’t have enough evidence yet to say how much sitting is bad," said Peter Katzmarzyk of the Pennington Biomedical Research Center in Baton Rouge, who led the Canadian study. "But it seems the more you can get up and interrupt this sedentary behavior, the better."

　　Figures from a U.S. survey in 2003-2004 found Americans spend more than half their time sitting, from working at their desks to sitting in cars.

　　Experts said more research is needed to figure out just how much sitting is dangerous, and what might be possible to offset those effects.

　　"People should keep exercising because that has a lot of benefits," Ekblom-Bak said. "But when they’re in the office, they should try to interrupt sitting as often as possible," she said.

　　1．What is the best title for the text?

　　A. Not Sitting Too Much While Working      B. How To Avoid Sitting Too Much

　　C. Sitting Too Much Could Be Deadly          D. More And More People Sit Too Much

　　2．According to the research,______________.

　　A. the more time you spend in exercising in a single bout, the healthier you will be.

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