50. According to the passage, which of the following is the most pressing issue for the megacities?
(A) To return the city population to the countryside.
(B) To minimize the occupancy of land surface and reduce waste.
(C) To stop city inhabitants from ruining soils, water supplies and forests.
(D) To establish a new urban living option through collaboration.

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統計： A(46), B(129), C(124), D(209), E(0) #1540116

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If we were to protect what is left of nature, and meet the demand to improve the quality of living for the world’s developing nations, finding a new form of city living seems to be the only solution by mobilizing collaborative efforts to address this urgent agenda

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