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题库 / Prep2007E2-SC-46
Genetic engineering sometimes entails plant or animal genes' getting spliced into other species' DNA, either to improve crop yields or for warding off insects or disease.
plant or animal genes' getting spliced into other species' DNA, either to improve crop yields or for warding off
plant or animal genes that get spliced into the DNA of other species, either for improving crop yields or the warding off of
the splicing of plant or animal genes into other species' DNA, to either improve crop yields or to ward off
splicing plant or animal genes into the DNA of other species, either to improve crop yields or to ward off
splicing of plant or animal genes into the DNA of other species, for either the improvement of crop yields or to ward off
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entail sth/doing sth，需要某物/某事，如：
The job entails a lot of hard work. 这工作需要十分艰苦的努力。
These plans entail great expense on us.这些计划需要我们承担大笔经费。
A，基因工程需要被分离，来提高作物产量；SVC，植物基因做分离的定语，处于第二层
D，基因工程需要分离基因A到基因B，来提高作物产量；SVOO结构，植物基因作宾语之一。
由目的状语“来提高作物产量”可知，“植物基因”作为被分离的对象、达到目标的载体，应该在句子里占据显眼位置，D优于A。
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