A:21点至23点
B:23点至凌晨1点
C:凌晨1点至3点
D:24点
A.天然气 B.沼气 C木材 D.____
I'll pick you up at the stop sign where 50 meters ahead the two roads .
请回答下列问题:
Before, I was quiet. Now, I'm very active in class.
____
分解因式:(x+2)(x+4)+x2﹣4=____.