2. 外语
  3. If a single strain of plant is used for a given crop over a wide area, a practice fostered by modern seed-marketing methods, it

If a single strain of plant is used for a given crop over a wide area, a practice fostered by modern seed-marketing methods, it

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问题 If a single strain of plant is used for a given crop over a wide area, a practice fostered by modern seed-marketing methods, it increases the likelihood that the impact of single crop disease or pest will be disastrous.
选项 A、If a single strain of plant is used for a given crop over a wide area, a practice fostered by modern seed-marketing methods, it
B、If a single strain of plant is used for a given crop over a wide area, as is fostered by modern seed-marketing methods, it
C、A practice fostered by modern seed-marketing methods, a single strain of plant used for a given crop over a wide area,
D、A single strain of plant used for a given crop over a wide area, a practice fostered by modern seed-marketing methods,
E、The use of a single strain of plant for a given crop over a wide area, a practice fostered by modern seed-marketing methods,
答案E
解析 A中it指代有误，它应优先指代前面的a single strain of plant，而不是a practice fosteredby modern seed marketing-methods(而只有指代后者，it才能与后面的动词increases搭配)；退一步说，就算能指代，两个相同意思的词紧接在一起是重复；B中：在as一章中，曾提到as可指代前面的整个句子，但把其代入作主语，与谓语is foster是搭配不起来的；同时，it找不到指代对象(a strain或an area都不能作increase的动作执行者)；C中：逻辑关系错误。从语法上看，名词短语a single strain of plant应该是对主语a practice的同位解释，实际上，这两者属不同概念，作同位语是不可能的；D同理，a practice短语也不能作前者的同位解释，而若Asingle strain of plant作为主句的主语则与动词increases在逻辑上搭配不当。E为正确答案。theuse和a practice就属同类，同时a practice的内涵远远大于the use，因而这里的同位解释不仅符合语法原则，又符合逻辑，同时the use和increases之间的搭配得当，表达了句意。
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