题目内容

The author was interested in his actual class because of _________.

A. the way the teacher lectured
B. the responsibility
C. the first class itself
D. the class that was his

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The impression the author gained from his own class was_________.

A. embarrassing
B. boring
C. simple
D. fresh

受众规模非常大或非常小，执行调查的价格就可能（）。

A. 越贵
B. 越便宜
C. 越平均

如何撰写问卷开头的调查介绍，会让被调查者填写问卷的态度更积极，更诚恳。

什么是误差范围？请举例说明。