Besides producing fewer greenhouse gases, a modern turbofan is about 80% quieter...

Questão de Inglês da banca CESPE CEBRASPE aplicada no concurso ANAC (2009). Confira a resolução completa abaixo:

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Judge the following items about the ideas and the linguistic
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Besides producing fewer greenhouse gases, a modern turbofan is about 80% quieter than 1960 jets.