The Word "here" (Para, 1, Line 3) refers to ______. The passage is mainly about ______.

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问题 The Word "here" (Para, 1, Line 3) refers to ______.
The passage is mainly about ______.

选项 A、the agriculture revolution
B、the invention of labor-saving machinery
C、the development of scientific agriculture
D、the farming machinery in America

答案B

解析 此题考查的是考生对整篇短文主要内容的理解。由第一部分开始,文章总体结构围绕节省劳动力的机械发明展开,文章的中心思想应当是节省劳动力的机器发明。
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