0.1里面有______个1100，215里面有______个125．

若a，b是常数，则“a＞0且b²-4a＜0”是“对任意x∈R，有ax²+bx+1＞0”的（　　）

A．充分不必要条件

B．必要不充分条件

C．充要条件

D．既不充分也不必要条件

— The child is said to have _____  gift for teaching deaf children.

— She's something. I think it calls for _____ patience and imagination.

[      ]

A. a; the

B. the; the

C. a, /

D. /; a

关于幽门梗阻不正确的是（）

A.每于食后即引起呕吐

B.呕吐物含发酵、酸性宿食

C.呕吐后患者可觉轻松

D.可出现脱水及酸碱失衡

E.空腹检查胃内可有振水音

He served in the army in _______ when he was in his twenties. [ ]

A. 1940's

B. 1940s

C. the 1940s

D. the 1940s'

脊髓小脑共济失调的确诊依据是（）

A.病史和体征

B.家族史

C.基因检测

D.实验室检查

E.影像和神经电生理检查