1. Why should people leave cars at home?
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答案
Because driving cars causes too much air pollution.
2. How many more calories are burned per hour by walking than by riding?
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答案
About 60 calories.
3. How do you like the green living way? Why?
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答案
I think the green living way is very important. Because it can help us protect the environment.(言之有理即可)
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