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（1）为（）

A.analysis phase

B.design phase

C.implementation phase

D.maintenance phase

1968年，美国著名的心理学家罗森塔尔做了一个实验。他从小学每个年级抽出部分学生，进行所谓的“预测未来发展”的测试，学生名单交给任课教师。实际上，罗森塔尔并未做任何真正实际的测验，只是随意抽取部分学生的名字，在这些学生中，有的是教师意料到的，有的不是。过了一学期后重测，发现那些被随意抽出的学生各方面都获得了较大的进步，成绩明显提高。
这一事例说明了什么问题在教育、教学中使你受到哪些启发