GRE Text Completion Question 3380
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Source: NO4
Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases; consequently, hereditary diseases that are（i）_____would be expected to be very（ii）_____, but, surprisingly, they are not.
- A lethal.. rare
- B untreated.. dangerous
- C unusual.. refractory
- D new.. perplexing
- E widespread.. acute