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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由答語中的后一句"它是人類最早的飛行工具"可知是氣球。

題目來源：仁愛英語同步練習(xí)冊九年級上冊下冊合訂本 > Topic1 When was it invented?

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