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题型：单选题 题类：常考题 难易度：普通
教科版（广州）2018-2019学年小学英语三年级下册Module 4单元测试卷（音频暂未更新）
—OK, here you are.
— Where is the black {#blank#}1{#/blank#} from?
— It's from the factory. It makes the air {#blank#}2{#/blank#}.
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