题干
—________ you ________ take a bus to school?
—Yes. But now I usually go to school on foot.
A：Did; use to
B：Were; used to
C：Do; use to
D：Are; use to
答案(点此获取答案解析）
A
(
为常数)，表示的平面区域的面积是8，则
的最小值为( )
