GRE Text Completion Question 3715
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Source: PP2
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