女性，18岁，发热咽痛鼻出血10天，胸骨压痛明显，右下肢皮肤可触3cm×3cm大小肿块，质硬。RBC2×10⁹／L，HGB60g／L，WBC2×10⁹／L，PLT20×10⁹／L，骨髓增生极度活跃，原始细胞80％，部分胞浆中可见Auer小体，POX染色弱阳性，PAS染色胞浆淡红色，醋酸萘酚酯酶染色阳性，能被NaF抑制，诊断是（）

A.急性粒细胞白血病

B.急性早幼粒细胞白血病

C.急性单核细胞白血病

D.急性红白血病

E.急性淋巴细胞白血病

Which of the following statements about debt securities is most likely correct（）

A. A collateralized mortgage obligation is a derivative of a passthrough security with a payment structure that redistributes risk among investors in various tranches.

B. Insured bonds are bonds collateralized by an escrow of securities guaranteed by the U. S. government.

C. Tax-backed municipal bonds are supported through revenues generated from projects that are funded in whole or in part with the proceeds of the original bond issue.