2. 外语
  3. Which of the following statements is supported by the passage? In the past, people did not have security alarm systems installe

Which of the following statements is supported by the passage? In the past, people did not have security alarm systems installe

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问题 Which of the following statements is supported by the passage?
In the past, people did not have security alarm systems installed in their homes, because ______.
选项 A、security alarm systems were not safe at all
B、security alarm systems were easy to break down
C、security alarm systems were not available
D、security alarm systems required complicated wiring techniques, individualized design, and sometimes lots of carpentry
答案D
解析 第二段的最后一句表明以前要安装类似装置需要复杂的电线技术、个性化的设计，有时还需要大量的木工活。
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