单项选择题

The pronoun "They" (Line 1, Par

A．4) refers to ______.A. the London citizensB. those who commute to London from other placesC. managers who are anxious about their staff getting to workD. 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