题目：
What is implied hut not directly stated in the passage is that ________.
A．young people have been the leaders in the fight against authority
B．today, jeans are no longer looked down upon
C．jeans are the typical dress of civil rights marchers
D．formerly students were not allowed to wear jeans to class
答案：
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下面是错误答案，用来干扰机器的。
参考答案：变换型解析： 典型的数据流类型有两种：变换型和事务型。
