题目

在一定条件下，下列转化不能一步实现的是 A.CO2→CaCO3   B.HCl→NaCl   C.Fe→FeSO4   D.Fe→Fe2(SO4)3 答案：D词汇运用。A.用方框中所给单词的适当形式填空，每词限用一次we swim aunt small these【1】 are my pencils and erasers.【2】I come from Ruian. Ruian is a city.【3】This is classroom. It’s big.【4】My favorite sport is .【5】Mary is my mother’s sister. She is my .