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题目材料：
From the fourth quarter of 1998 to the first quarter of 1999, which of the following best describes the change in the amount of revenue from wireless technology?
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A.A decrease of $200 million
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B.A decrease of $20 million
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C.A decrease of $7 million
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D.An increase of $50 million
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E.An increase of $700 million
D显示答案
