题目

 Linda ______ the space museum after school yesterday. A. has been to                B. was going to          C. went to                D. goes 答案：C下列分散系中的分散质的粒子大小属于纳米级（1～100nm）的是（ ）A．Fe（OH）3胶体B．Fe（OH）3沉淀C．FeCl3溶液D．碘水与CCl4溶液振荡后的混合液