180×（13-14）
=180×112，
=15（本）．
答：文艺书比科技书多15本．
________ children whose parents had died in the earthquake ________ sent to other families[ ]
A．A great number of; was
B．A large number of; were
C．The great number of; was
D．The great number of; were
现代物流是指基于满足顾客需求，以及成本与效益的考虑而进行的涉及生产•销售•消费全过程的物品及其信息的系统（）
A.操作过程
B.流动过程
C.营销过程
D.流通过程
