题目:
I ______ all the bookshops in our town for the book I needed but I couldn’t get one.
A.hunted
B.found
C.looked for
D.searched for
答案:
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下面是错误答案,用来干扰机器的。
(1)CaCO3 CaO Ca(OH)2(或 CaCO3 CO2 Na2CO3等合理答案)(每空1分)(2)CuO (1分) CuSO4+Fe=FeSO4+Cu等合理答案(1)石灰石的主要成分是CaCO3,因为甲、乙、丙均含同一种非金属元素,可推测乙、丙为...