2. 外语
  3. Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases;

Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases;

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问题 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.
选项 A、lethal…rare
B、untreated…dangerous
C、unusual…refractory
D、new…perplexing
E、widespread…acute
答案A
解析 空格(i)：
- 方程等号：consequently表示因果，同义重复。
- 强词和对应：hereditary diseases和inherited diseases同义重复，指遗传病，that引导定语从句修饰hereditary diseases，severe指向空格(i)，取同，体现病是“严重的”。lethal致命的，untreated未得到治疗的，unusual不同寻常的，new新的，widespread普遍的。untreated表示病“没有得到治疗”，不体现病“严重”，untreatable才是“无法治疗的”。因此选项A合适。
空格(ii)：
- 方程等号：consequently表示因果，前后逻辑同向，句意同义重复。
- 强词和对应： 自然选择消除(eliminate)严重的疾病，eliminate指向空格(ii)，根据consequently取同，体现病被“消灭”。rare罕见的，dangerous危险的，refractory顽固的，perplexing令人困惑的，acute剧烈的。综合空格(i)，答案选A。
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