34. What is one major challenge mentioned in the passage regarding rapid urbanization?
(A) A decline in technological advancements.
(B) A decrease in pollution levels in cities.
(C) Overcrowding and rising housing costs.
(D) A reduction in employment opportunities.
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統計: A(0), B(1), C(31), D(0), E(0) #3432667
統計: A(0), B(1), C(31), D(0), E(0) #3432667