题目:
—How was your vacation?
—_______. [ ]
A. That sounds good
B. I went to see operas
C. It was humid
D. It was pretty good
答案:
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工业上炼铁时,把铁矿石和焦炭、石灰石一起放入高炉,在高温条件下,把铁从铁矿石中还原出来.某炼铁厂用含杂质20%的赤铁矿(主要成分是Fe2O3)冶炼生铁.含杂质20%的800t赤铁矿中氧化铁的质量为:800t×(1-20%...