GWD13-11，答案B和C，讨论过，但似乎没定论，NN看看

Q11:

A South American bird that forages for winged termites and other small insects while swinging upside down from the foliage of tall trees, the graveteiro belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and that are represented in virtually every kind of habitat.

1. graveteiro belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and that are
           
2. graveteiro belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and is
           
3. graveteiro belongs to the ovenbird family, a group of New World tropical birds that include more than 230 species and is
           
4. graveteiro, which belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and that are （B）
5. graveteiro, which belongs to the ovenbird family, a group of New World tropical birds that includes more than 230 species and is

我选C，总觉得that后要用复数，修饰birds。。。