Miss Yang plays basketball ________ swims on the weekend.
A:or
B:but
C:so
已知a1,x,y,a2成等差数列, b1,x,y,b2成等比数列.则(a1+a2)2b1b2-2的取值范围是 ( )
小鹏手握橡皮擦,突然放手后,橡皮擦将( )