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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