在句子"I wonder if he sensed my reluctance to be seen with him during our walks. If he did, I am sorry I never told him how sorry I was, how unworthy I was, how I regretted it." 中 (if he)did指代的是___________
A.
walk with me
B.
know how sorry I was
C.
sensed my reluctance to be seen with him during our walks
【简答题】.设函数y=f(x)的定义域为(0,+∞),且对任意的正实数x, y,均有 f(xy)=f(x)+f(y)恒成立.已知f(2)=1,且当x>1时,f(x)>0。 (1)求f(1), f( )的值; (2)试判断y=f(x)在(0,+∞)上的单调性,并加以证明; (3)一个各项均为正数的数列{a n }满足f(S n )=f(a n )+f(a n +1)-1,n∈N*,其中S n 是数列{a n...