[单项选择]

At no time in history has there been such a mass movement of people from countryside to city as is happening now. By the year 2030, it’ s estimated that more than two thirds of the word’ s population will be living in cities, twice as many as today. This means that the problems faced by cities to day-overcrowding, poor housing, unemployment, poverty, and lack of food water--will be twice as had in the next century, unless we find solutions soon.
Another serious issue is how to provide good transport to their citizens. Many world’ s major cities are already struggling with out-of-date transport infrastructures. How can they deal with the additional demands in the 21^stcenturyLondon is a good example. It was the world’ s first big city--the first with a population of a mil lion people. Its enlargement was made possible by the invention of the steam engine, which powered the world’s first underground railway. But
A. the London citizens
B. those who commute to London from other places
C. managers who are anxious about their staff getting to work
D. passengers who make complaints

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