试题题干
It is assumed that the world has approximately 3000 (some put it 5000) languages, which can be grouped into roughly（）language families on the basis of similarities in their basic word stock and grammar.
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试题解析
It is assumed that the world has approximately 3000(some put it 5000)languages, which can be grouped into roughly 300 language families on the basis of similarities in their basic word stock and grammar. 据估计, 世界上约有 3000多种(有人认为有5000种)语言。这些语言可以根据他们的基本词汇和语法的相似性大致划为300个谱系。