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 a single crop disease or pest will be disastrous.
(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）
(E) The use of single strain of plant for a given crop over a wide area, a practice fostered by modern seed-marketing methods,
Choice A is faulty because the pronoun it and the appositive a practice each lack a noun referent. Nor are there logical referents in choice B for as is and it. Choice C entails a false appositive: the sentence now says that the single strain of plant is itself a practice fostered by modern seed-marketing methods, not that the use of a single strain is such a practice. Choice D reverses the order of the constructions, but the appositive remains illogical. Choice E is correct: use is the proper subject for the verb increases and a logical governing noun for the appositive practice. This question is of middle difficulty.
看了以前的讨论，说同位语可以用来修饰前面的整个句子，那么D为什么不对呢
还是同位语必须有一个相应的中心名词？
请NN指教
再加一题GWD1-16,结合看看
Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.
这题好像争来争去都没确定结果
从同位语角度来看，a greater propotion than it was in any previous election，修饰整个句子，构成独立的部分
it 指代propotion，选项A比较合理，一下子又搞不清什么时候用that指代什么时候用it
NN不吝指教~~~~鞠躬
Choice C entails a false appositive: the sentence now says that the single strain of plant is itself a practice fostered by modern seed-marketing methods, not that the use of a single strain is such a practice.
D不对的原因和C一样 practice的同位语只能是应用（use） 不能是变种本身
顺便附上对strain的解释：Strain (biology), a variant of a plant, virus or bacterium; or an inbred animal used for experimental purposes
(D) A single strain of plant used for a given crop over a wide area, a practice fostered by modern seed-marketing methods,
a single strain cannot be equaled with a practice, and this is why D is not the right choice
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