单选题：Virgin America is singled out in the passage to show that __

题目分类：英语六级
题目类型：单选题
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题目内容：

Virgin America is singled out in the passage to show that _________ A．some airlines are unbundling ticket prices for profits
B．passengers are not happy with their practice
C．some airlines provide customers with clear policies
D．some airlines provide passengers with extra service

参考答案：

答案解析：

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