A.f(x)+g(x)f(x)·g(X)均不连续
B.f(x)+g(x)不连续,f(x)·g(x)的连续性不确定
C.f(x)+g(x)的连续性不确定,f(x)·g(x)不连续
D.f(x)+g(x)f(x)·g(x)的连续性均不确定