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阅读理解

English serves as an alternative language in several areas of public activity for the many nations of the world which employ it as an international second language. English has been adopted as the language of air traffic， commerce， as well as international diplomacy. Moreover， English is the language of the majority of published materials in the world so that education has come to rely heavily on an understanding of English.

Speakers are classified into two groups__________.

A.in order to learn English better

B.is widely used in several areas of public activity

C.has played an important role in the field of education

D.for the sake of simplicity

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