—________are you going there?
—By bus.
A:What
B:When
C:Where
D:How
middle, tall, high, short, a little
A lot of trees _________ around here every year, and we can enjoy fresher air now.
把二次函数y=﹣14x2﹣x+3用配方法化成y=a(x﹣h)2+k的形式时,应为( )