7. Through the 19th century, water and air pollution and the accumulation of solid wastes were largely problems of
_______ urban areas.
(A) specious
(B) constellation
(C) congested
(D) remote
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統計: A(66), B(56), C(146), D(91), E(0) #2430756
統計: A(66), B(56), C(146), D(91), E(0) #2430756