Which of the trend is true? The central concern of the writer is ______.

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问题 Which of the trend is true?
The central concern of the writer is ______.

选项 A、the increase of cars
B、the increase of population
C、the expansion of nuclear power
D、the possible environmental pollution

答案D

解析 根据第二段,人口的增长、汽车数量的增加、核能的应用所导致的直接后果都是对环境可能造成的污染。
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