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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托福（TOEFL）

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