Why do you have _____? [ ]

A. a long hair

B. long hair

C. a few long hair

D. long hairs

6岁小儿轻度贫血的诊断指标是（）。

A.Hb＞120g/L

B.Hb～120g/L

C.Hb～90g/L

D.Hb～60g/L

E.Hb～30g/L