单项选择题

In the author's opinion, the following may cause city people to be unhappy EXCEPT______.

A．a sense of fear
B．housing conditions
C．lack of communication
D．a sense of isolation
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填空题
Research on insects suggests that____________(细菌在动物进化过程中扮演着举足轻重的角色).
单项选择题
Which of the following best describes people who work in large cities and live in villages
A．Normal.
B．Arrogant.
C．Original.
D．Insensitive.
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