患者男性，40岁。牙龈出血，发热半个月，既往肝炎病史4年。查体：全身散在瘀斑，以下肢为多，左侧颈部可扪及2个黄豆大小的淋巴结，胸骨中段压痛，两肺呼吸音清晰，HR90次/分，律齐，肝脾未扪及。

提示：患者血常规Hb50g/L，WBC12×10⁹/L，Plt7×10⁹/L，原始细胞30%。骨髓增生活跃，可见一类形态异常细胞，核仁多而明显，胞浆蓝染．无颗粒，该类细胞CD13⁺．CD33⁺．CD14^-，胞浆MPO+。该患者的诊断是（）

A.肝癌骨转移

B.急性淋巴细胞白血病

C.急性粒细胞白血病

D.淋巴瘤

E.骨髓增生异常综合征伴原始细胞过多型

F.慢性淋巴细胞白血病

An analyst does research about marginal benefit and marginal cost. If the government sets a production quota below equilibrium, which of the following statements is most accurate The effect at the quota quantity is that:（）

A. marginal cost exceeds market price.

B. marginal benefit exceeds market price.

C. marginal benefit exceeds marginal cost.