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    (   ) 1. —Do you know what it is in the picture?

         ——It's a       It was the earliest flight tool(工具)of human beings.

    A. computer    B. robot

    C. balloon    D. block

    l.C由答语中的后一句"它是人类最早的飞行工具"可知是气球。

    题目来源：仁爱英语同步练习册九年级上册下册合订本 > Topic1 When was it invented?

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