Key exam 1
( 1) D
( 2) D
( 3) A
( 4) A
( 5) D
( 6) B
( 7) D
( 8) A
( 9) C
(10) A
(11) A
(12) C
(13) B
(14) B
(15) A
(16) B
(17) C
(18) B
(19) B
(20) B