单选题
The mankind should face the phenomenon that the world has become a world of cities with ______.
A、
a lot of difficulties
B、
efforts to improve housing condition
C、
pressure of the basic needs
D、
new models and a great deal of transformation of ideas and methods
【正确答案】
D
【答案解析】
[解析] 由第一段最后一句可知答案。
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