rocket which could travel over the surface⑱ of water and hit⑲ an enemy ship.

But not everybody wanted to use rockets in battles.Wan Hu，a Chinese government official，invented a flying chair.He attached two big kites to the chair，and 47 rockets to the kites.The rockets were lit⑳，there was a huge explosion and clouds of thick smoke.When the smoke cleared\s\up7(21(21) Wan Hu and his chair had disappeared\s\up7(22(22).No one knows what happened.Did Wan Hu die in the explosion？Or was he carried miles into space，becoming the world's first astronaut？

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①rocket n.火箭　②advanced adj.高级的；先进的

※which引导定语从句，修饰先行词machines，且在从句中作use的宾语。

③firework n.焰火　　　④celebrate vt.庆祝

⑤millennium n.千年 ⑥gunpowder n.火药

⑦explosion n.爆炸；爆炸声　⑧explode vi.爆炸

⑨escape vi.逃跑escape from逃离......

※that引导的从句作discovered的宾语。该宾语从句中，现在分词短语作定语，修饰gas。

⑩at war处于战争状态

⑪battle n.战役；斗争　⑫arrow n.(弓)箭

⑬be attached to被拴/捆到......上

※which引导的定语从句修饰前面的stick，该从句中含有"keep＋宾语＋宾补"结构，宾补由现在分词短语充当。

⑭keep...doing...使......一直做......

⑮straight adj.直的　⑯direction n.方向

※本句属于and连接的并列句。前一分句中"特殊疑问词/whether＋不定式"结构，其中how表示方式，该结构在此作learned的宾语。后一分句"It is＋adj.＋that从句"，其中it是形式主语，真正的主语是后面的that从句。

⑰be used for被用来......

⑱surface n.表面over the surface of在......表面上

⑲hit v.击中(hit，hit)