73．Which of the following shows the path of the signals described in Paragraph 5？
Answer key
C
Which of the following shows…——2011 高考英语第 83 题答案解析
2011_山东卷 (英语)
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difficulty
Differentiating
2011_山东卷 (英语)
73．Which of the following shows the path of the signals described in Paragraph 5？
C