单项选择题

In the 1950s, classroom violence ______.

A．was something unheard of
B．was by no means a rare occurrence
C．attracted a lot of pubic attention
D．began to appear in analysts' data
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单项选择题
Which of the following characterizes the traditional communities
A．Great mobility.
B．Concern for one's neighbors.
C．Emphasis on individual effort.
D．Ever-weakening social bonds.
单项选择题
Professor Einstein is pleased to see that Americans ______.
A．have adapted to a new set of moral standards
B．are longing for file return of the good old days
C．have realized the importance of material things
D．are awakening to the lowering of their moral standards
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