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