题目

When his mother came in, he pretended (do) his homework. 答案：【1】to be doing 下图所示的直型石英玻璃封管中充有CO气体，左端放置不纯的镍(Ni)粉．在一定条件下，Ni可以与CO(g)发生如下反应： Ni(s)＋4CO(g)Ni(CO)4(g) 但Ni粉中的杂质不与CO(g)发生反应．玻璃管内左右两端的温度分别稳定在350K和470K，经过足够长时间后，右端的主要物质是 [　　] A． 纯Ni(s)和Ni(CO)4(g) B． 纯Ni(s)和CO(g) C． 不纯Ni(s)和CO(g) D． 不纯Ni(s)和Ni(CO)4(g)