问题描述:
M____of years ago,people looked at the f__ birds in the sky and thay wanted to fiy.They tried
many different w__to fly.First,they made wings f___pieces of paper.Then they put these wings on and jump off a hill into the a__.
many different w__to fly.First,they made wings f___pieces of paper.Then they put these wings on and jump off a hill into the a__.
问题解答:
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