下列说法正确的是（　　）

A．大吊车的可活动部分相当于动物的关节

B．肱骨属于后肢骨

C．人体的每一块骨骼肌都附着在一块骨上

D．动物的运动仅仅靠运动系统来完成

—What do you think of this jacket?

—Well, I like its color, but the price is a little bit too ______. I don't think I can afford it. [ ]

A. cheap

B. low

C. expensive

D. high