Apples are my favourite ______.
A:drink
B:fruit
C:food
—______ I complete the composition today, sir? —No, you needn't. You may _______ tomorrow morning.
作此诗时,诗人只有49岁,但他却用“老无力”形容自己,你怎么看?
已知函数f(x)=log2(ax2+4x+5).