大全15

1.
                A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and mob cars at the stoplights.
    

(A) A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and
    

(B) Visible at Managua’s major intersections are waves of vendors and beggars with many children, new phenomena that
    

(C) A new phenomenon visible at Managua’s major intersections is waves of vendors and beggars, many of them children, who
    

(D) Phenomenally new waves of vendors, beggars, and many children are visible at Managua’s major intersections, which

 (E) A wave of vendors and beggars, many of whom are children, are visible at Managua’s major intersections, where they are a new phenomenon and

答案是C，想请问，看见很多帖子说many of them children是独立主格，想请问一下，我怎么觉得这是同位语呢？独立主格有什么用呢？他可以做同位语吗？