根据首字母填空:Pollution is a serious problem in major cities t___ the world.

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根据首字母填空:Pollutionisaseriousprobleminmajorcitiest___theworld.根据首字母填空:Pollutionisaseriousprobleminmajo

根据首字母填空:Pollution is a serious problem in major cities t___ the world.
根据首字母填空:Pollution is a serious problem in major cities t___ the world.

根据首字母填空:Pollution is a serious problem in major cities t___ the world.
(throughout) the world
整个世界