∵4＜5＜9，5的整数部分是a，
∴a=2，b=5-2，
∴a2-b2=4-（5-2）2=45-5．
软性角膜接触镜用于下列哪一种情况最为适宜()
A．高度散光
B．老视眼
C．角膜白斑
D．大泡性角膜炎
E．无晶状体眼
－ What do you think of the movie?
－ It’s fantastic. The only pity is that I __________ the beginning of it.
A． Missed
B．had missed
C．miss
D．would miss
