考博考试

【单选题】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
网考网参考答案：A
网考网解析：
第一段提到2030年估计世界多于2/3的人口将会居住在城市，这意味着the problems faced by cities today．．．will be twice as had in the next century，unless we find solutions soon，可见是人口过度导致城市面临诸多问题。 查看试题解析出处>>