以下带团用品中，哪一项是地陪不必携带而全陪必须携带的物品（）。
A.与各地接社的结算单
B.导游证
C.接待计划
D.身份证
参考答案：A
布雷顿森林体系是采纳了哪一项计划的结果 ( )
A．怀特计划
B．凯恩斯计划
C．布雷迪计划
D．贝克计划
Which of the following statements is most accurate in describing total surplus with respect to a product or service（）
A. Price minus marginal cost, summed over the quantity bought.
B. Marginal benefit minus price, summed over the quantity bought.
C. Marginal benefit minus marginal cost, summed over the quantity bought.
