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填空题
An alarm system usually consists of motion detectors.____
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解析：
由题干关键词“alarm system”可定位到G段。原文“components”说明了报警系统的组成部分，此处用“consist of”（包括）表达的意思相同。故匹配段落为G段。
由题干关键词“alarm system”可定位到G段。原文“components”说明了报警系统的组成部分，此处用“consist of”（包括）表达的意思相同。故匹配段落为G段。
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