50. Why did the author write this passage?
(A) To emphasize the importance of research on global warming.
(B) To call the public’s attention to a serious issue.
(C) To compare food production in different areas of the world.
(D) To predict what the world will be like in the future.
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統計: A(150), B(500), C(52), D(57), E(0) #943367
統計: A(150), B(500), C(52), D(57), E(0) #943367