the world's population has grown very ——.（fast）
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theworld''spopulationhasgrownvery——.（fast）theworld''spopulationhasgrownvery——.（fast）theworld''spopulati
the world's population has grown very ——.（fast）
the world's population has grown very ——.（fast）
the world's population has grown very ——.（fast）
就是 fast
这里可用作副词