一般足球比赛，每队至少7名队员上场方可进行比赛。

—The book isn’t easy for Jack to understand, is it?

—____. His foreign language is far better than expected.

A．No, it isn’t

B．I’m afraid not

C．I don’t think so

D．Yes, it is

When first ______ to the market, these new products in their company enjoyed a great success.

A．Introducing

B．introduced

C．to introduce

D．being introduced

不适合作为根管充填糊剂的是（）。

A.氢氧化钙糊剂

B.碘仿糊剂

C.氧化锌丁香油糊剂

D.玻璃离子体

E.氟化钠甘油糊剂

In the past 5 years a great deal of money _____ improving the environment of the school.

A．is spent

B．has been spent

C．was spent

D．had been spent

男性，40岁，3天前头部外伤，当时无意识障碍，2小时后出现头痛，抬高头位时加剧，伴恶心、呕吐，平卧后可减轻。查体：无阳性体征，头颅CT未见异常。

下列哪项治疗正确()

A．20%甘露醇250ml12小时一次静点

B．镇静

C．头高足低位

D．脑室穿刺引流

E．平卧位，增加液体摄入量