填空题

Fifty years ago, most people"s daily levels of activity 21 walking three to five miles a day; today, the average person fails to cover that 22 in a week.
It"s no wonder the incidence of obesity 23 —with serious implications for health.
We use cars, buses or trains to 24 ; our children are driven to school; escalators and lifts have replaced conventional stairs 25 , offices and apartment blocks.
Washing machines, vacuum cleaners, 26 and electric mowers all minimise the effort 27 to maintain a clean and tidy home.
Television has us tethered 28 .
Almost one third of adults spend 29 sitting down every day, adding up to a staggering average of 30 and four months over a lifetime.
Hardly surprising, then, that researchers 31 this sedentary lifestyle for our weight gain.
Our waistlines 32 one major reason: increasing inactivity.
So what is the 33
The secret is integrated exercise. It might mean standing to 34 and pacing the room, 35 on the floor as you work. It means never taking the car when you could walk; 36 standing on short train and bus journeys, or walking at 37 you feel you might break into a run if you were to go 38 .
A Dutch study 39 that people who spend more time doing moderate, integrated-style exercise 40 those who performed shorter, sharper workouts.

答案: over ten hours
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