---Emma has to stay at home to look after her little sister,  ?

---Yes, because her mother has gone to the supermarket.

A．does she

B．is she

C．doesn’t she

D．hasn’t she

贫血的实验室检查包括（）

A.肾功能检查

B.肝功能检查

C.骨髓检查

D.血常规检查

E.贫血的发病机制检查