题目内容

以下是从本单元课文中摘出的原句。试试看，能填上吗？要注意词形变化！

1．Who knows when humans first ________　________ flying like a bird?

2．________　________　________ fast they ran, they could not ________　________　________ the land．

3．________ early humans realized it or not, they had one advantage which would eventually ________ them ________ fly：a human brain with unlimited potential．________ humans were not born with wings, they could ________　________ how to make their own wings．

4．________, many people throughout time have strapped wings to their bodies and jumped from towers or cliffs ________　________　________　________ fly．

5．Leonardo da Vinci ________　________　________　________ think about how a flying machine would actually be built．

答案：
解析：

　　1．dreamed of

　　2．No matter how; break loose of

　　3．Whether; enable; to; Although; figure out

　　4．Doubtless; in an attempt to

　　5．was the first to


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