The bill had support from the government, business and naturalists. A. It became an important first step toward establishing Yellowstone as the first national park in America in 1872. B. It was followed by Yosemite, General Grant, and Sequoiam which each became national parks as well without Watkins' photos, the lawmakers ~
여기서 A, B it 이 각각 가리키는 것은 무엇인가요??
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