Modern cities can be great places in which to live. They can also be hellholes, overcrowded, dirty, noisy, and polluted. Much of the blame for that _____19_____ traffic congestion. But city planners are fighting back and _____20_____ with innovative ways to make some of the world’s great cities good to live in once again. Let’s take London for example. Elected in May 2000, mayor Ken Livingstone vowed to tackle congestion by charging vehicles coming into the city center. In February 2003, his administration introduced a daily $12 toll for entering a 22-square-kilometer central zone. In a 2003 poll, 63 percent of Londoners said they supported the charge, for the simple reason _____21_____ it works. Fifty thousand fewer vehicles a day go into the city. Roads are less congested, there are fewer accidents, and journey hours are faster. London’s success has not gone _____22_____ . “Every major city in the world has asked us about congestion charging,” says Transport for London spokesman Graham Goodwin. 【題組】21 (A)which (B)where (C)that (D)why
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