For amortizing bonds that have the same maturity date, the reinvestment risk for an investor holding the bonds to maturity is greatest for the bonds that are selling at:（）

A. a premium to par value.

B. a discount to par value as a result of the bonds being issued as zero-coupon bonds.

C. a discount to par value as a result of market yields increasing after the bond was issued.

符合粉刺型导管内癌的描述是（）

A.多发生在乳晕区

B.属浸润性乳腺癌

C.易发生腋窝淋巴结转移

D.预后差

E.肿瘤细胞异型性小