选择题
01-05 C B D B B
06-10 B B B B B
11-15 B C C B C
16-20 D C A D C
21-25 A D B B B
26-30 D A C D B
31-35 D A D B C
36-40 C B C A D
41-45 D B A B A
46-50 C B B C C