题目内容

600多年前，中国便有了原始火炮。More than 600 years ago ____ were used in China.

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利用火药燃烧产生的推力发射炮弹。Cannon balls were ____ by the thrust of the huo yao explosion.

今日的火药也被广泛用于烟火。Now, huo yao is also in .

2008年北京奥运会上，无数绽放在空中的美丽烟火，令人惊叹不已，带给人全新的美感。The ____ fireworks at the Beijing Olympic Games garnered wide acclaim and admiration from the audience.

吊、杀上网是一种( )战术

A. 进攻战术
B. 防守战术
C. 相斥战术
D. 过渡战术