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Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases; consequently, hereditary diseases that are _____ would be expected to be very _____, but, surprisingly, they are not.
- A.lethal . . rare
- B.untreated . . dangerous
- C.unusual . . refractory
- D.new . . perplexing
- E.widespread . . acute
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以上解析由 考满分老师提供。
