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  3. Which aspect of the Homestead Act of 1862 does the passage mainly discuss? It can be inferred that the "safety valve" in line

Which aspect of the Homestead Act of 1862 does the passage mainly discuss? It can be inferred that the "safety valve" in line

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问题  Which aspect of the Homestead Act of 1862 does the passage mainly discuss?
  It can be inferred that the "safety valve" in line 13 refers to
选项 A、a new kind of machinery
B、an alternative for urban workers
C、an area in a factory
D、a procedure designed to protect workers
答案D
解析
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