单选题In the 1950s, classroom violence ______.Awas something unheard ofBwas by no means a rare occurrenceCattracted a lot of public attentionDbegan to appear in analysts’ data
单选题
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
参考解析
解析：
细节题。第五段末句指出“Data show that Americans are struggling with problems unheard of in the 1950s such as classroom violence and a high rate of births to unmarried mothers.”据此，可以判定A项为答案。
细节题。第五段末句指出“Data show that Americans are struggling with problems unheard of in the 1950s such as classroom violence and a high rate of births to unmarried mothers.”据此，可以判定A项为答案。
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