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—How amazing it is that astronauts are exploring outer space!
—It's a challenge, I guess, ______  man against nature.
A．of B．for
C．by D．a(chǎn)bout
A
A 考察介詞。應(yīng)答句中的I guess是插入語，因此所填介詞與challenge連用，表所屬，使用of。選A。句義：我猜想它是人對自然的挑戰(zhàn)。
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