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

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

admin2010-06-11  53
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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