2. 外语
  3. It’s implied in the first paragraph that some people possessed productive labor except ______. What indicates the discovery of

It’s implied in the first paragraph that some people possessed productive labor except ______. What indicates the discovery of

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问题 It’s implied in the first paragraph that some people possessed productive labor except ______.
What indicates the discovery of ways to harness energy?
选项 A、Changes of the world.
B、Scientific revolution.
C、Use of steam engine.
D、Advanced machines.
答案C
解析 文中的表达是：Once people found ways to harness energy—using steam engines，提问只是换了一种说法，其它三选项文中也提到了，但是指这一发现的实践。
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