下列物质中，属于高分子化合物的是[ ]
A．油脂
B．蔗糖
C．羊毛
D．葡萄糖
答案：C
Look at these books. I love ______ very much. [ ]
A. they
B. their
C. them
试述KZW-6型空重车自动调整装置的构造？
