The analysis comes just two years after Australian researchers found that people who said thy 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．Thoe 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．Kazmaezyk． one of' the lead researchers． But while the evidence of inesses 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 an 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 alernative to exercising, but an alternative to sitting．"Several sudies show that when you're sitting, your leg muscles are completely inactive," he said． "When you're stting and completely inactive, this is when you run into trouble managing blood glucose （血糖）．"

　　29．What is the main idea of he first paragraph?

　　A．Watching TV too long can orsen our mental health．

　　B．We should he active and give up smoking．

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