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阅读理解
From London to New York,from Hong Kong to Moscow,the subway is an important way of transportation(交通)．Traffic in modern cities is often very heavy,and it can sometimes take hours to cross a busy city in a car or on a bus．If you take a subway,you don't watch the traffic lights．The subways don't have to stop at traffic lights,and hundreds of people can take a subway together．
In larger subway systems(体系),such as Mexico City's,there are many subway lines in the city．In this way,people living in the suburbs(郊外) can take a subway to work．This is a good type of transportation,and it makes less pollution(污染) than the buses,cars,and trains．pollution is a big problem in many cities．Finally,subways are usually cheaper．Don't you like it?
1．Which is an important way of transportation from London to New York?
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2．Do you watch the traffic lights if you take a subway?
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3．How many people can take a subway together?
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4．How do the people living in the suburbs go to work?
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5．What kind of transportation is cheaper?
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