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

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

单项选择题

What is the passage mainly concerned with

A．The relationship between depression and suicide.
B．Men's higher risk of committing suicide.
C．Reasons for women's lower risk of committing suicide.
D．Causes of women's depression.

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