隋朝大运河的一段利用了春秋时期吴王夫差开凿的古运河.这一段是( )
A:永济渠
B:通济渠
C:邗沟
D:江南河
在△ABC中,AB=3,A=45°,B=75°,则BC=( )
—Jack ________ride a motorcycle to work.— Yes, but now he ________ there as motorcycles are not allowed on our city streets.