my ()OF hearing is not so good as it used to be

B sense..

sense
n.
官能, 感觉, 判断力, 见识, ...感, 意义, 理性

vt.
感到, 理解, 认识

听力是感官意识..所以选B

B: sense 固定短语 sense of hearing
the five senses 五官感觉: hearing, vision/sight, smell, touch and taste

sense of hearing , 听觉

a力气,力量
C.能力, 权力
D .技巧

A是强壮B是感觉C是力量D是方法技巧

B

B