Which of the following statements is supported by the passage? According to the passage, ______.

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问题 Which of the following statements is supported by the passage?
According to the passage, ______.

选项 A、security alarm systems can only be installed in commercial and industrial establishments and in large homes
B、security alarm systems are still very expensive
C、now, people can buy low-cost security alarm systems and install themselves
D、security alarm systems can’t scare off vandals

答案C

解析 最后一段表明这种装置现在便宜了,而且可以自己安装。
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