The parents were shocked by______news that their son needed______operation on his knee.

A．A; /

B．the; /

C．the; an

D．a; an

慢性特发性血小板减少性紫癜合并贫血最适宜的检查是（）

A.血清铁蛋白测定

B.血清叶酸测定

C.血红蛋白电泳

D.酸溶血试验

E.红细胞渗透脆性试验