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题型：语法填空（单句） 题类： 难易度：普通
外研版（2019） 选择性必修 第三册 Unit 5 Learning from nature 分层跟踪检测
You'd better write down the telephone number {#blank#}1{#/blank#}you forget it.
In 2007, she developed the first G﹣Series High﹣Speed Train in China which was operated{#blank#}1{#/blank#}300﹣350 kph.
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