bai kiem tra thu

ten: huynh thi huynh nhu
lop: ktsclrmt_k6_3n
cau 1: a
cau 2: d
cau 3: c
cau 4: d
cau 5: d
cau6: a
cau7: c
cau8; a
cau9: d
cau10:d
cau11: a
cau12: a
cau13:c
cau14: c
cau15:d
cau16:a
cau17:c
cau18:b
cau19:a
cau20;d