50. What does the word “They” (in the second line of the last paragraph) refer to?
(A) Environmental laws.
(B) Environment organizations.
(C) Developing countries.
(D) Industrialized countries.
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統計: A(3), B(55), C(5), D(2), E(0) #488715
統計: A(3), B(55), C(5), D(2), E(0) #488715