A:have attended
B:will be attending
C:am about to attend
D:would attend
定义在R上的奇函数f(x)对任意x∈R都有f(x)=f(x+4),当 x∈-2,0时,f(x)=2x,则f(2012)-f2011的值为( )
如图为人体排泄有关的主要器官结构示意图,请据图回答: