如图所示，一束光从直角三角形玻璃砖AB面垂直射入，并从玻璃砖AC面射出．请画出该过程的光路图．
Never before ______ in greater need of modern public transport than it is today. [ ]
A. has this city been
B. this city has been
C. was this city
D. this city was
张岱年在《中国文化概论》中指出，“明清的早期启蒙思想家们的先天不足，具有一种时代性的缺陷”。其“时代性的缺陷”主要表现为（）
A.资本主义萌芽发展缓慢
B.封建势力异常强大
C.西方殖民势力的不断渗透
D.资产阶级力量薄弱
