Which of the following statements is true according to the text? Judging from the context, the word "they"(Line 2, Para. 4) ref

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问题 Which of the following statements is true according to the text?
Judging from the context, the word "they"(Line 2, Para. 4) refers 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 本题上下文词义题。根据代词的就近指代的特点,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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