Your sock drawer contains ten pairs of white socks and ten pairs of black socks. If you’re

A. a grain of
B. a ray of
C. a point of
D. a drop of

A. 细动脉壁玻璃样变
B. 水变性
C. 黏液样变性
D. 血管壁纤维样变性
E. 淀粉样变性