Though seats in the library are tight,my friend Tom had ________ one for me. A.observed B.deserved C.reserved D.served 答案:C [考查动词辨析。句意:尽管图书馆的座位很紧张,我的朋友Tom还是帮我留了一个座位。reserve“保留”,符合句意。observe“注意到,观察到”;deserve“值得,应得”;serve“供应,提供”。]如图所示的光路图中,正确的是A. B. C. D.