已知函数f(x)是奇函数,且在(-∞,+∞)上为增函数,若x,y满足等式f(x2-2x)+f(y)=0,则2x+y的最大值是[ ]
A.0
B.1
C.4
D.12
答案:C
He always keeps silent when others are talking excitedly, ________ inwardly he is a man full of passion.
A.and
B.for
C.so
D.yet
前组鼻窦开口于:()
A.上鼻道
B.中鼻道
C.下鼻道
D.总鼻道
E.嗅沟