单项选择题

The pronoun "They" (Line 1, Para. 4) refers to ______.

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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单项选择题

It is believed that ______.

A．overpopulation causes the problems in cities
B．two-thirds of the world' s population are living in cities today
C．it isn' t difficult to solve the problems faced by cities today
D．with fewer people, we would be free from any problems

单项选择题

The following paragraph would most probably deal with ______.

A．train and air travel
B．traffic jams in London
C．possible solutions to London' s poor transportation
D．car ownership that continues to grow