研究文件产生、运动、变化的过程和规律的理论主要是( )
A．文件连续体模型
B．文件生命周期理论
C．文件阶段论
D．公文阶段论
参考答案：B
用所给动词的适当形式填空。
1. We were looking forward to____ (visit) Shanghai World Expo .
2. The law of gravity____ (discover) by Isaac Newton about 350 years ago.
3. You must try your best to stop him____ (make) the same mistake again.
4. Jack said he____ (return) the two books to the library in a week.
5. He prefers____ (take) part in the public activities rather than stay at home alone.
根据整体医学模式的观点，预防冠心病要()
A．改变A型行为
B．改变高盐饮食行为
C．改变不运动行为
D．改变过度应激竞争的生活方式
E．以上均正确
