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  3. What is the passage mainly about? The passage mentions which of the following as a result of improvements in factory machinery

What is the passage mainly about? The passage mentions which of the following as a result of improvements in factory machinery

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问题  What is the passage mainly about?
  The passage mentions which of the following as a result of improvements in factory machinery?
选项 A、It become easier for factory’ owners to find workers and customers.
B、Manufacturers had to employ more highly skilled workers.
C、The amount of power required for factories operate was reduced.
D、Factories could operate more than one engine at a time.
答案A
解析
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