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问题：
[不定项选择题] 资料：Virgin America helped Airbus pip Boeing at the post to retain its crown as the world’s largest commercial plane maker.Airbus trailed its arch-rival Boeing in number of orders for most of 2010 but m
A、it has multiple options when it comes to its engine
B、it is a single-aisle jet
C、it is more fuel-efficient and environmental-friendly
D、it has a more powerful engine
参考答案：
C、it is more fuel-efficient and environmental-friendly
● 参考解析
