如图下列简单机械中属于费力杠杆的是： [ ]
A.用铡刀铡草
B.用瓶起子开啤酒瓶
C.用独轮车运沙子
D.用铁锨挖土
答案：D
She spent as much time as she could . [ ]
A. to learn English
B. playing with her kid
C. study a new language
D. played basketball
娱乐业是指为娱乐活动提供场所和服务的业务，应按20%的税率征收营业税。( )
