请大神指教这篇英语阅读理解答案是什么?Mostoftheworld’sdiamondscomefromAfrica,butthereisoneplaceintheUnitedStateswheretheyarefounds.ItisnearMurfreesboro,Arkansas.DiamondswerefirstfoundnearMurfreesboroin1

Question

请大神指教这篇英语阅读理解答案是什么?
Most of the world’s diamonds come from Africa,but there is one place in the United States where they are founds.It is near Murfreesboro,Arkansas.
Diamonds were first found near Murfreesboro in 1906.About 50 thousands have come from this field.One 40 carat (克拉) diamond was the largest ever found in North America.But most of the stones were too small to make mining worthwhile.Soon all mining stopped there.Today a visitor to Murfreesboro hunt for diamond himself.
A few diamonds have been found in sand and gravel(砾石) along the Great Lake,too.This is not where they were originally found.They may have been formed far to the north and carried south by the last great glaciers (冰川).
46.Most diamonds have been found in ____.
A.North America B.South America C.Africa D.Arkansas
47.Diamonds in their original ground have been found _____.
A.in Arkansas B.in several states C.around the Great Lake D.All of the above
48.The Murfreesboro field was ____.
A.never mined B.mined until there were no more diamonds
C.not worth mining D.mined large valuable stones
49.In Murfreesboro today,the visitors can____.
A.watch miners at work B.explore an old mine C.hunt for diamonds D.find large valuable stone
50.The diamonds found along the Great Lakes were____.
A.carried there from other places B.not found in their original ground
C.found in the rocks where they were formed D.both A and B

Answer 1

46. Most diamonds have been found in __C__.
A. North America B. South America C. Africa D. Arkansas
47. Diamonds in their original ground have been found __A___.
A.in Arkansas B. in several states C. around the Great Lake D. All of the above
48.The Murfreesboro field was __C__.
A. never mined B. mined until there were no more diamonds
C. not worth mining D. mined large valuable stones
49. In Murfreesboro today, the visitors can__C__.
A. watch miners at work B. explore an old mine C. hunt for diamonds D. find large valuable stone
50. The diamonds found along the Great Lakes were_D___.
A. carried there from other places B. not found in their original ground
C. found in the rocks where they were formed D. both A and B
世界上大多数的钻石来自非洲,但在美国,他们发现一个地方有砖石.那就是莫夫里斯波洛附近,阿肯色州.
首次在莫夫里斯波洛附近发现砖石是在1906,大约5万的砖石都开采自这个领域.一个40克拉（克拉）的钻石是有史以来在北美发现的最大的.但大部分的石头太小,不值得开采.很快,所有的采矿作业停止.今天一个拜访者自己访问莫夫里斯波洛去寻找钻石.
他在大湖的砂和砾石（砾石）发现了一些钻.但这些砖石不是在它们最初被开采的地方.他们可能形成于遥远的北方,最后被大冰川（冰川）运输到南方.