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题库 / Prep2008E2-SC-160
In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is lined with lead around the perimeter, thereby improving stability in flight and resulting in longer throws.
In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is
According to a previous design, the weight of the discus used in track competition was concentrated in a metal center, but now it is
Once designed with its weight concentrated in a metal center, the discus used in track competition is now
The discus used in track competition, once designed with its weight concentrated in a metal center, but now
The discus used in track competition was once designed having its weight concentrated in a metal center and now
题目分析：
略。
选项分析：
A选项：通常，代词的指代对象应是名词词组的核心词。因此，本选项中it的指代对象为weight of the discus，这在逻辑上是有问题的。真正在周边放上铅的应该是discus，而不是discus的重量；另外，is concentrated应改为was concentrated，划线部分给出了明显的过去时间in a previous design。
B选项：介词according to措辞有误，according to的意思是“根据”，我们不能说，“根据过去的设计，质量怎么怎么安放”，而应该说，“在过去的设计中，质量是怎么怎么安放的”。
C选项：Correct. 本选项在语法和逻辑上均是正确的。once designed with its weight concentrated in a metal center是伴随状语，其主语为the discus。
D选项：全句缺少谓语动词。
E选项：并列连词and身后缺少谓语动词。
质量在中心和铁饼周围放了铅并没有but的关系。一个自身属性（质量集中位置），一个设计方案（周围加了其他物质），无法形成转折逻辑。两个同为铁饼的属性关系更合适，原来的一个属性和现在的一个新属性，原来设计为质量在中心，现在在铁饼周围放了铅。
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