间接经验与直接经验相结合，反映教学中传授系统的科学文化知识与丰富学生的______的

在一次生日聚会上，有人提议与会的每名同学都与其他同学握一次手．已知参加这次聚会的所有与会者共握手105次，那么参加此次聚会的同学共有______人．

氧气的化学性质比较活泼，点燃细铁丝在氧气的集气瓶里剧烈燃烧，生成黑色固体(四氧化三铁)，它的化学反应文字表达式为：                             ,反应类型          .

Most of the local restaurants were fully booked more than a month ________. [ ]

A. in return  

B. in case

C. in advance  

D. in time

根据句意，在答卷标有题号的横线上，写出括号内所给单词的适当形式。

小题1:How strange he is! Maybe he is the __________ (mad) man I have ever seen.

小题2:The manager asked if the message on the desk was for one of the _________ (salesman).

小题3:After school all the students went out of the classroom __________ (noise).

小题4:The man in his __________ (forty) is the person who saved that boy.

Many of the activities performed during the preliminary investigation are still being conducted in(1)，but in much greater depth than before.During this phase,the analyst must become fully aware of the(2)and must develop enough knowledge about the(3)and the existing systems to enable an effective solution to be proposed and implementeD. Besidesthe(4)for process and data of current system,the deliverable from this phase also includes the(5)for the proposed system.

空白（3）为（）

A.hardware environment

B.testing environment

C.software environment

D.business environment