the 10th

P70 324
[U]Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart.[/U]
这句话我是看了好几遍都没有选对。
(A) Unlike most warbler species, the male and female blue-winged warbler are very difficult to tell apart.
(B) Unlike most warbler species, the gender of the blue-winged warbler is very difficult to distinguish.
(C) Unlike those in most warbler species, the male and female blue-winged warblers are very difficult to distinguish.
(D) It is very difficult, unlike in most warbler species, to tell the male and female blue-winged warbler apart.
(E) Blue-winged warblers are unlike most species of warbler in that it is very difficult to tell the male and female apart.
a.答案是E，为什么？顺便请好心的大虾们帮我指出剩下几个选项的错误。
b.请问有没有 the book is very difficult to read. 这样的句型。