某物流企业建立电子商务网站，通过网络招揽运输业务，我们通过对其运输业务历史数据的分析，确定单位变动成本为100元/千吨公里，固定成本总额为30万元。本月预计货物运输业务量为6000千吨公里，单位运价为120元/千吨公里，请对该物流企业的运输业务进行本量利分析。（1）求运输业务的盈亏平衡点。（2）求运输公司的税前利润。
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电商企业年需A商品3000件，单价300元/件，年保管费率为15%，每次订货成本为500元。（1）求经济定购批量和库存平均储存量。（2）求年订货次数、订货时间间隔及与订货相关的年总库存成本。
There _____ an apple and three books on the table.
A. are
B. is
C. am
D. were
______ no eed for us to discuss the problem again since it has already been settled.
A. It has
B. There has
C. It is
D. There is
They are _____ a meeting.
A. having
B. taking
C. on
D. in
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