【单选题】
A、Some U.S. $50 million.
B、About U.S. $500 million.
C、Some U.S. $500 billion.
D、About U.S. $5,000 billion.
网考网参考答案:D
网考网解析:
[听力原文] How much will be spent by people worldwide on vacation in abroad by the year 2015
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