诊断凝脂翳最可靠的依据是：（）
A.黑睛生翳
B.疼痛剧烈
C.视物模糊
D.伴前房积脓
E.细菌培养
参考答案：E
Toni Morrison, Nobel Prize-winning American writer, says if there’s a book you really want to read, but it ______ yet, then you must write it.
A．hasn’t been written
B．hasn’t written
C．doesn’t write
D．isn’t written
信息系统的开发策略应以
A．机构为中心
B．业务为中心
C．应用为中心
D．数据为中心
