难度层级二:隐形双重否定
• 难度级别:★★★
• 表现形式:否定词+隐形否定词
常见隐形否定词: unless; without; prevent/keep/preclude...from..; little/few; hardly; rather than; instead of等
• 中文示例:在西安,这样的天气没有空调你几乎没有存活的几率。(如果要存活就必须有空调)
• 真题示例:”However, minimum efficient scale cannot be fully realized unless a steady “throughput” is attained.” ——《GMAT官方指南2017版》
• 一招制敌: 条件句的否定后加must
在本句中,强调unless之后的内容,需要在unless 之后的内容里加上must,即:“However minimum efficient scale can be fully realized on condition that a steady “throughput” must be attained.”(然而,要实现最小有效规模,必须达到一个稳定的生产量。)
• 演练:They should not agree to serve unless they are committed to maintaining a stance of impartiality.” ——《GRE官方指南》
• 解析:本句中的双重否定为:“should not...unless...”,在条件句的否定词后加must,本句可简化为:“They should agree to serve on condition that they must maintain a stance of impartiality.” 如果他们要担当(调停者),那么就必须保持公正的立场。