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  3. Traffic In Our Cities The volume of traffic in many cities in the world tod...

Traffic In Our Cities The volume of traffic in many cities in the world tod...

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问题 Traffic In Our Cities
The volume of traffic in many cities in the world today continues to expand. This causes many problems, including serious air pollution, lengthy delays, and the greater risk{pz_填空}(51) accidents. Clearly, something must be done, but it is often difficult to
persuade people to{pz_填空}(52) their habits and leave their cars at home.
One possible{pz_填空}(53) is to make it more expensive for people to use their cars by{pz_填空}(54) charges for parking and bringing in tougher fines for anyone who{pz_填空}(55) the law. In addition,drivers could be{pz_填空}(56) to pay for using particular routes at different times of the day. This system,{pz_填空}(57) as"road pricing”,is already being introduced in a{pz_填空}(58) of cities, using a special electronic card{pz_填空}(59) to the windscreen of the car.
Another way of{pz_填空}(60) with the problem is to provide cheap parking on the{pz_填空}(61) of the city , and strictly control the number of vehicles allowed into the centre. Drivers and their passengers then use a special bus {pz_填空}(62) for the final stage of their journey.
Of course, the most important{pz_填空} (63) is to provide good public transport.However, to get people to give{pz_填空} (64) the comfort of their cars, public transport must be felt to be reliable, convenient and comfortable, with fares{pz_填空}(65) at an acceptable level.
选项 A quantity
B number
C total
D sum
答案B
解析a number of “一些”，用在可数名词前面。total和sum都是表示“总计”。
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