题目

(1998年全国，14)将铁屑溶于过量盐酸后，再加入下列物质，会有三价铁生成的是(    )A.硫酸          B.氯水            C.硝酸锌            D.氯化铜 答案：BC The topic, _______ we devoted a heated discussion last night, is a hot issue at present.A．whichB．whereC．to whichD．for which