消费者剩余消费者剩余
参考答案：
消费者对于一种产品愿意并能够支付的与实际支付的差额。
It is good ________ for an Arab to stand ________ his friend when they are talking.
A．manners; close to
B．manner; close to
C．manners; closely to
D．manner; closed to
针刺操作时应注意轻、慢、压的腧穴是
A．肩井B．承泣C．瞳子髎D．委中
