1 3 A u hu ng y c n B f t zh n l C g w l j D h n h m i y n A A 2 3 ( ) A B C D C A B D A 3 A B C D D A B C D B 4 A B C D B B B 5 A / / B / / C / / D / / A / / B 6 (1) _ _ (2) _ _ _ _ (3)_ _ (4) _ _ (1) (2) (3) (4) A 7 ( ) A B C D C B 8 ( ) A B C D A B C D B 9 ( ) A B C D C A B D B 10 (1) (2) (1) (2) B / / /