单项选择题

The author thinks of humor as an amusement because it______.

A．constantly fails to amuse people
B．is persuasive
C．can be employed against others
D．does not cause discomfort
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单项选择题
In which part of a book is the passage likely to appear
A．After words.
B．Contents.
C．Preface.
D．Index.
单项选择题
Why did he find it more difficult to write orders
A．It needed the understanding of various military terms.
B．The writing required more accuracy and conciseness.
C．The different army units used diverse languages.
D．The knowledge of army equipment was difficult to master.
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