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　　文章来源：

　　All Systems Stop

　　from the Economist August 13, 2016

　　One reason for the complexity is that airlines were early adopters of computerised systems. They built their first electronic reservation systems in the early 1950s; Delta’s current system once belonged to a defunct airline that went bust in 1982. But as airlines merged and more new functions were added—from crew scheduling to passenger check-in and bag tracing— they have come to resemble technological hairballs in which one small problem quickly spirals into bigger ones that

　　even experts struggle to disentangle.

　　1.Why the system of the airlines is so complicated?

　　A) One small problem will bring reservation systems down.

　　B) New functions were added to the early users of the airlines.

　　C) Airlines introduced the IT system in early days.

　　D) IT system was introduced in Airlines’ infancy.

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