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Most advocates of space exploration by the United States would not explicitly associate spaceflight with (i)_____, yet that belief, Launius and McCurdy write, is among the roots of arguments (ii)_____ human spaceflight. Throughout United States history there has been (iii)_____—seek utopia—on the frontier, and many space advocates have used that notion to make their case for exploring and settling space.
Blank(i)Blank(ii)Blank(iii)
A、entertainmentD、questioningG、a hostile region fit only for the most self reliant
B、irrationalityE、analyzingH、the ideal location for one to better oneself
C、utopiaF、promptingI、a paradise corrupted by European civilization
答案：C,F,H

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