WORD格式
At the next attempt, they ___4___ for passengers use a balloon to rise into the air and fly. We do not know what the passengers felt about the trip as they were a cock, a duck, and a sheep. But we ___5___ know that the trip lasted eight minutes and
the animals landed safely.
31. 第（1 ）空格处应选择以下哪项：
A. instead
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