【判断题】An artificial aid is a piece of equipment such as a whip,gireth or spur that the rider uses to backup a natural aid.
【单选题】供给学派认为,()边际税率可以增加劳动力的供给和需求,从而()税后总供给。
【简答题】v. to seize or take into control by force
【判断题】The natural aids that the rider uses are the hand, leg, seat,body and voice aids.
【简答题】a___________ v. to take as a fact ; suppose
【判断题】按概念的抽象程度分为初级概念和二级概念。