题目内容：
In the 1950s, classroom violence
A．was something unheard of B．was by no means a rare occurrence
C．attracted a lot of public attention
D．began to appear in analysts' data
参考答案：
答案解析：
单选题：In the 1950s, classroom violence
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B．was by no means a rare occurrence
C．attracted a lot of public attention
D．began to appear in analysts' data