不属于多基因遗传病的是（）
A.痤疮
B.银屑病
C.白癜风
D.鱼鳞病
E.斑秃
参考答案：D
社会学者常把职业划分为______与______。
Buying an interest-rate cap and selling an interest-rate floor is equivalent to:()
A. buying a series of interest-rate calls and selling a series of interest-rate puts.
B. buying a series of interest-rate puts and selling a series of interest rate calls.
C. buying a series of interest-rate puts and calls.
