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.
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Athat all of the thousands of languages spoken by the world's five billion people can be traced
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Bthat the world's five billion people speak thousands of languages of which all can be traced
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Cthe world's five billion people speak thousands of languages which are all traceable
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Dall of the thousands of languages spoken by the world's five billion people to be traceable
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Ethe ability to trace all of the thousands of languages that are spoken by the world's five billion people
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正确答案: A