题目内容
The passage is mainly about___________.
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The word “line” (Para. 3, underlined word) means ____________.
.It is difficult to say how “rock and roll” began because it came from so many different countries and so many different kinds of music and musicians.
One can hardly imagine what early rock and roll would be like without Elvis Presley.
Within two years, Elvis Presley became a well known singer throughout the nation.
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