Which of the following statements is true according to the text? Judging from the context, the word "they"(Para. 4) refer to __

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问题 Which of the following statements is true according to the text?
Judging from the context, the word "they"(Para. 4) refer to ______.

选项 A、the security risks
B、the terrorist attacks
C、environmental hazards of over-centralization
D、the security risks, economic expenses, and environmental hazards

答案D

解析 本题是上下文词义题,根据代词的指代就近的特点,此处的“they”也即是前一句的主语The security risks,economic expenses,and environmental hazards。
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