input question: Write a multi-choice question for the following article, with the given choices and answer: Article: China's economy grows,salaries rise;and more city residents feel the need to hit the road in what has become a symbol of individuality and freedom--a car.China has a growing love affair with the car.This is clear at the Beijing Asian Games Village Automobile Exchange,where more and more people come to look and,increasingly,to buy. The Asian Games Village Automobile Exchange is the biggest car dealership inBeijing.General manager Guo Yong says the business sells more than 2,000 cars each week.Guo says it is much easier for Chinese consumers to buy a car now.Also,the emergence of less expensive domestic brands like Chery and BYD means more Chinese can afford cars. For decades,most Chinese city residents have got about by bicycle or public buses and trains.Now,in many areas,the number of new cars is growing faster than the road system,leaving city streets jammed with traffic. Guo Liang has wanted to buy a car for a decade,and he will be the first in his family to own one.He is not prevented by Beijing's traffic jams.Guo says if the traffic is too bad,he will use the ear for leisure or holidays with his family. World Bank transportation specialist Shomik Mendhiratta says a car is something people in any society would be eager to own."Getting a car makes people feel like they have arrived in the middle class."Mendhiratta said."It has got a huge status associated with it.It's a fantastic thing to have,if you have never had a car.A car gives you a mobility that's unbelievable." Options: A It makes people less healthy. B It makes city streets jammed with traffic. C It makes people often go to work late. D It makes people belong to the middle class. Answer: B It makes city streets jammed with traffic. Question:???
output answer: What's the problem caused by the growth of new cars?

Write a multi-choice question for the following article, with the given choices and answer: Article: One of the most widely accepted, commonly repeated assumptions in our culture is that if you exercise, you will lose weight. I exercise all the time, but I still have gut fat that hangs over my belt when I sit. Why isn't all the exercise getting rid of it? It's a question many of us could ask. More than 45 million Americans now belong to a health club, up from 23 million in 1993. We spend some $19 billion a year on gym memberships. Of course, some people join and never go. Still, as one major study -- the Minnesota Heart Survey -- found, more of us at least say we exercise regularly. And yet obesity figures have risen sharply in the same period: a third of Americans are obese, and another third count as overweight by the Federal Government's definition. Yes, it's entirely possible that those of us who regularly go to the gym would weigh even more if we exercised less. But like many other people, I get hungry after I exercise, so I often eat more on the days I work out than on the days I don't. Could exercise actually be keeping me from losing weight? The popular belief that exercise is essential for weight control is actually fairly new. As recently as the 1960s, doctors routinely advised against too much exercise, particularly for older adults who could injure themselves. Today doctors encourage even their oldest patients to exercise, which is sound advice for many reasons: People who regularly exercise are at significantly lower risk for all manner of diseases -- those of the heart in particular. They less often develop cancer and many other illnesses. But the past few years of obesity research show that the role of exercise in weight loss has been wildly over-evaluated. "In general, for weight loss, exercise is pretty useless," says Eric Ravussin, exercise researcher at Louisiana State University. Many recent studies have found that exercise isn't as important in helping people lose weight as you hear so regularly in gym advertisements or on shows likeThe Biggest Loser -- or, for that matter, from... Options: A some Americans join a health club but never go there B the number of overweight people has doubled since 1993 C more than 45 million Americans now go to the gym regularly D Americans waste too much money each year on sports Answer: A some Americans join a health club but never go there Question:
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Answer: From the passage we learn that _ .

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Like distance runners on a measured course,all of us will move through time in a roughly predictable pattern. In the first stage of our lives,we develop and grow, reaching toward the top of physical vitality . After we grow up,however, the body begins a process of gradually wearing out. A new awareness of physical fitness may help lengthen our years of health and vitality,yet nothing we do will work to stop the unavoidable force of aging. Most of the changes of aging take place deep inside the body.The lungs become less able to take in oxygen.Powerful muscles gradually lose their strength.The heart loses power and pumps less blood.Bones grow easier to break. Finally, we meet a stress,a stress that is greater than our physical resistance.Often,it is only a minor accident or chance infection(a disease caused by virus),but this time, _ brings life to an end. In 1932,a classic experiment nearly doubled the lifetime of rats,simply by cutting back the calories in their diet The reason for the effect was then unknown. Today, at the University of California at Berkley, Dr.Paul Seagle has also greatly lengthened the normal lifetime of rats.The result was achieved through a special protein limited diet,which had a great effect on the chemistry of the brain.Seagle showed that within the brain,specific chemicals control many of the signals that influence aging.By changing that chemical balance,the clock of aging can be reset. For the first time, the mystery of why we age is being seriously challenged.Scientists in many fields are now making striking and far-reaching discoveries. An average lifetime lasts 75 years,yet in each of us lies a potential for a longer life.If we could keep the vitality and resistance to disease that we have at age twenty, we would live for 800 years. Options: A By keeping their physical fitness. B By cutting the calories in their diet. C By resetting their clock of aging. D By limiting the protein in their diet. Answer: D By limiting the protein in their diet. Question:
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The answer is:
How did Dr.Paul Seagle lengthen the lifetime of rats in his experiment?