养生达人帅帅
新视野大学英语视听说4uint 4 QUIZE 75%1-5 CCABA6-10 DABAB11.giant12.storeys13.tail14.fuel15.theatre16. Imagine17.Fortunately18.And each plane there‘re twice many engines as the jet need to fly19.If the engines fail on the same side,the plane can easily uses other engines in order to land20.There are also two mechanical pilots to take charge of plane if human pilot cannot fly the plane
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