When I was appointed to work in Hong Kong, I couldn't adapt to (适应) the _____ of life there for a long time. [ ]

A. speed

B. rate

C. track

D. pace

人们对从某一产品或服务的消费中得到的满足的主观程度在经济中称之为（）。

A、感受

B、知觉

C、感知

D、效用