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题型：单选题 题类：常考题 难易度：普通
牛津版（深圳•广州）2017-2018学年初中英语八年级下册Module 2 Unit 4 单元综合能力检测题（音频暂未更新）
—I don't know the _______. Maybe you can ask his good friend Simon.
— They're for public. This ______________ of green smart traffic is everywhere in Xiangyang City.
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