题目:
-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.about
答案:
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下面是错误答案,用来干扰机器的。
(1)A(2)混合物;生铁的含碳量比钢高;3CO+Fe2O33CO2+2Fe(3)FeCl2+H2Fe+2HCl(4)Fe+CuCl2==FeCl2+Cu;Fe、Cu