第二节：完型填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，掌握其大意，然后从36---55各题所给的四个选项（A,B,C,D）中，选出可以填入空白处的最佳选项
Few countries will admit officially that they employ spies. _36_, from time to time a spy is caught and the public sometimes gets a glimpse (一瞥) of what is going on behind _37_ scenes. Spies are rarely _38_ these days. They are frequently tried and imprisoned. If a(n) _39_ is important enough, he is sometimes _40_ to an enemy country in exchange for an equally important spy whom the enemy had caught. Few people have the _41_ to witness such exchanges, for they are carried out in _42_
One cold _43_ morning last year, a small blue car stopped on a _44_ in a provincial town in northern Germany. _45_ men dressed in heavy black coats got out and stood on the bridge. 46_ they waited there, they kept on looking over the side. Fifteen minutes later, a motor-boat sailed past and _47_ the river-bank. Three men got_48_ the boat and looked up at the bridge. The men on the bridge _49_ walked down the stone steps leading to the _50_. No words were spoken when they _51_ the men from the boat. After a while, the _52_ moved off and three men _53_ the bridge. Now only two of them were _54_ black coats. The third was dressed in a light grey jacket. Anyone who had been watching the_55_ might not realized that two master spies had been exchanged on that cold winter morning.
36． A．As a result        B. Moreover     C. Therefore     D. However
37． A．political            B. war             C. personal      D. civil
38． A．caught            B. shot           C. praised       D. broadcast
39． A．leader             B. official       C. spy           D. judge
40． A．handed back          B. given out        C. held on        D. turn down
41． A．opportunity            B. pace          C. increase      D. performance
42． A．order               B. public          C. advance       D. secret
43． A．spring                 B. summer      C. autumn          D. winter
44． A．road                B. boat           C. railway          D. bridge
45． A．Kind                  B. Tall          C. Three          D. Old
46． A．While               B. In case         C. Before             D. Because
47． A．destroyed               B. drew up         C. sent away       D. set up
48． A．onto            B. over to        C. out of       D. opposite
49． A．silently           B. loudly            C. surprisedly     D. curiously
50． A．office            B. road           C. tree          D. river-bank
51． A．killed              B. met             C. saved         D. punished
52． A．car                B. bus              C. train             D. boat
53． A．left from            B. returned to      C. jumped off       D. died on
54． A．making             B. mending        C. wearing       D. tearing
55． A．film                 B. novel          C. river         D. scene