选择正确的答案( )
A:By bike.
B:On foot.
C:By bus.
求经过点A(﹣2,2)并且和两个坐标轴围成的三角形的面积是1的直线方程.
-Does your sister ___________ a CD ?
-Yes, she ___________.
已知等比数列an的公比为正数,且a3·a9=2a52,a2=1,则a1=( )