Today there are two new students in our class. I don't know ______ of them.
A:either
B:nor
C:neither
D:both
图一表示某生态系统中的食物网;图二是某条食物链中三种生物体内所含有机物总量的直方图.请据图回答问题:
A: How many _______.()
B: Eight.