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A high quality of the environment is essential for ______ ; on the other hand, the quality of the environment is threatened by ______.
A high quality of the environment is essential for ______ ; on the other hand, the quality of the environment is threatened by ______.
A.economic change; social effect
B.environmental consequences; economic consequences
C.tourism; tourist development
D.political consequences; social effect
正确答案是C
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