已知函数f(x)为奇函数,且当x<0时,f(x)=x2-1x,则f(1)=( )
蝴蝶在飞行时不停地扇动翅膀,但我们不能听到蝴蝶飞行的声音,这是因为( )
The Chopsticks Brothers ______ sings Little Apple won the International Song Award in 2014.