A:0,1
B:0,1)
C:0,1)(1,4
D:(0,1)
太阳中蕴藏无比巨大的能量,下列说法正确的是 ( )
已知函数f(x)=log2(x+1),g(x)=log2(3x+1).
After practicing for several months, I can swim much________now.