设f(x)是连续奇函数,g(x)是连续偶函数,区域D={(x,y)|0≤x≤1,-
x≤y≤
x},则正确的()
A.∫∫Df(y)g(x)dxdy=0
B.∫∫Df(x)g(y)dxdy=0
C.∫∫D[f(x)+g(y)]dxdy=0
D.∫∫D[f(y)+g(x)]dxdy=0