A、They’re expensive. B、They’re much faster than hydrogen balloons. C、They are more frequently used in the United States. D、They’

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问题

选项 A、They’re expensive.
B、They’re much faster than hydrogen balloons.
C、They are more frequently used in the United States.
D、They’re a lot safer than hot-air balloons.

答案A

解析

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大学英语六级

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