50．A．of                B．If not                  C．If so             D．However

A

    The Winter Olympics（冬季奥林匹克运动会）is also called White Olympics．At this time，many colorful stamps are published（发行）to mark（标志）the great Games．The first stamp marking the opening came out on January 25，1932 in the United States for the 3rd White Olympics．From then on，publishing stamps during the White Olympics became a rule（规定）．

49．A．alone            B．lonely           C．silently         D．silent

48．A．instead         B．instead of      C．besides         D．except

47．A．at                 B．to                 C．over                 D．of

46．A．don’t mean    B．mean           C．don’t like      D．like

45．A．since           B．if                 C．because         D．after

44．A．to be started  B．to be made    C．to be changed D．to be known

43．A．solve            B．find              C．know            D．find out

42．A．learn            B．see               C．find              D．show

41．A．speaking        B．thinking        C．seeing           D．reading