填空题 According to Darwin, random changes that enhance {{U}}a species'{{/U}} ability {{U}}for surviving{{/U}} {{U}}are{{/U}} naturally selected and passed on {{U}}to succeeding{{/U}} generations. A. a species' B. for surviving C. are D. to succeeding
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【正确答案】 1、B, 改for surviving为to survive    
【答案解析】[试题分析] 本题考查非谓语动词的用法。 [详细解答] 由于ability一词要求不定式做后置定语来修饰，故只有将for surviving改为to survive。