--- I am always feeling nervous before an exam.

---        ．Do believe your hard work will surely pay off.

A．Take your time

B．Take a good rest

C．Take it easy

D．Take your turn

下列哪项疾病是获得性溶血性贫血（）

A.丙酮酸激酶缺陷症

B.冷凝集素综合征

C.镰状细胞贫血

D.遗传性球形红细胞增多症

E.不稳定血红蛋白病