Directions: The following question presents a sentence, part of which or all of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.
A number of linguists contend that all of the thousands of languages spoken by the world's five billion people can be traced back to a common root language.
Reveal answer
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