题目内容
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提问人:网友ripplesyi
发布时间:2022-01-07
[主观题]
In the sentence "This simple technology is centuries old" in Paragraph One, "This simple t
echnology" refers to______.
A.using bullocks to produce energy
B.using pumps to draw water out
C.having bullocks walk around to make the pump move
D.connecting gears of different sizes to produce electricity
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