关于急性白血病的正确描述为（）

A.青少年多见

B.致死性

C.起病急剧

D.外周血红细胞增多

E.瘤细胞分化差

An investor gathers the following information about three U. S. Treasury annual coupon bonds:

Given the above information, how can the investor generate an arbitrage profit()

A. Purchase bond 1 while selling bonds 2 and 3.

B. Purchase bonds 2 and 3 and selling bond 1.

C. Purchase bonds 1 and 3 while selling bond 2.