人类进入阶级社会，（）成为主要的、典型的婚姻家庭形态。 A.对偶婚制 B.群婚制 C

Her cousin ______ swim when he _____ six years old.

[      ]

A. can, is

B. could, were

C. could, was

D. can, was

国际货运代理企业的信息化需求层次，大体有以下（）。

A、业务操作型

B、业务管理型

C、决策支持型

D、决策辅助型

You are a project manager for a small project. Your project was budgeted for ￥500,000 over a six-week perioD. As of today, you’ve spent ￥260,000 of your budget to complete work that you originally expected to cost ￥280,000. According to your schedule, you should have spent ￥300,000 by this point. Based on these circumstances, your project could be BEST described as ______

A．Ahead of schedule

B．Behind schedule

C．On schedule

D．Having not enough information provided

铝合金零件阳极氧化前预处理时，可用碱腐蚀溶液代替化学脱脂溶液。

根据《行政诉讼法》规定，相对人对具体行政行为不服直接向人民法院提起诉讼，应当在知道作出具体行政行为之日起（）内提起，法律另有规定的除外。

A、15日

B、30日

C、2个月

D、3个月