邮寄广告的邮寄对象的选择应该( )
A．随机抽取
B．由邮政公司确定
C．经过审慎选择
D．由消费者报名
参考答案：C
在排队系统的组成中，排队规则可以分为（）、（）和（）三种。
The government insisted on their project, _____ the expenses have risen. [ ]
A. as long as
B. as though
C. now that
D. even though
