GWD-24-Q 21: Nobody knows exactly how many languages there are in the world, partly because of the difficulty of distinguishing between a language and the sub-languages or dialects within it, but those who have tried to count typically have found about five thousand. A. and the sub-languages or dialects within it, but those who have tried to count typically have found B. and the sub-languages or dialects within them, with those who have tried counting typically finding C. and the sub-languages or dialects within it, but those who have tried counting it typically find D. or the sub-languages or dialects within them, but those who tried to count them typically found E. or the sub-languages or dialects within them, with those who have tried to count typically finding 答案A 但是 A中it 指代什么 对 partly because of the difficulty of distinguishing between a language and the sub-languages or dialects within it不清楚 partly because of the difficulty of distinguishing between a language and the sub-languages or dialects within it不清楚 partly because of the difficulty of distinguishing between a language and the sub-languages or dialects within it不清楚 | 
