a=1是直线y=ax+1和直线y=(a-2)x-1垂直的[ ]
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
答案：C
若6x2m-1-8＞5是一元一次不等式，则m=______．
Jenny says she might ______ a doctor in the future. [ ]
A. is
B. be
C. makes
D. to be
