单选题:Questions are based on the passage you have just heard.第19

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题目内容:
Questions are based on the passage you have just heard.
第19题答案为 A.To celebrate a historic flight.
B.To try out eighty new balloons.
C.To recruit balloonists from all over the United States.
D.To determine whether hydrogen balloons are out of date.

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答案解析:

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