Which aspect of the Homestead Act of 1862 does the passage mainly discuss? [br]

游客2024-01-05  7

问题  Which aspect of the Homestead Act of 1862 does the passage mainly discuss? [br]  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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