23. 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（C）

(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. 我的问题是many of them children 这是个什么结构？ 同位语？ 是不是应该用定语从句many of who are children还是many of whom are children?

15. In good years, the patchwork of green fields that surround the San Joaquin Valley town bustles with farm workers, many of them in the area just for the season.

(A) surround the San Joaquin Valley town bustles with farm workers, many of them?

(B) surrounds the San Joaquin Valley town bustles with farm workers, many of whom are

(C) surround the San Joaquin Valley town bustles with farm workers, many of who are

(D) surround the San Joaquin Valley town bustle with farm workers, many of which（A）

(E) surrounds the San Joaquin Valley town bustles with farm workers, many are

答案是a. 我的问题还是那个many of them 这个结构合理吗？

23 这里就是同位语。为什么要改成定语从句呢？改了以后变成2个定语从句连用，看着多不简洁啊。如改的话，变成many of whom are children,who mob cars....这样后面的那个定语从句不就变成修饰children了吗，有歧义。

15这里也是同位语。如果改成定语从句many of whom are我觉得也可以，但是答案中没有改的也对同时前面的动词用的也对的选项啊。