已知直线（2+m﹣m2）x﹣（4﹣m2）y+m2﹣4=0的斜率不存在，则m的值是（ ）
A：2
B：2或-12
C：-2
D：34
父母做出不道德的事也不批评和制止，才是孝的最高境界 。（ ）
relaxing, on, hour, useful, an, and, finish, from, favorite, after
Dear Jack,
I am very busy____Friday. At 8:00 I have math. It is not fun. The teacher says it is____ but I think it is difficult.____ that, I have P.E. at 11:00. It is easy____fun. Lunch is____12:00 to 1:00. I have Chinese at 1:20. It is my____subject. My classes____at 2:00, but then I have____art lesson for two____. It is really____.
How about you?
Yours,
Lucy
改革是社会进步的永恒主题。我国古代的一次改革，使秦国成为战国后期最富强的国家，为统一中国打下了基础。这次改革的名称是：（ ）
