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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。
Once designed with 【its】 weight concentrated in a metal center, the 【discus】 used in track competition is now lined with lead around the perimeter, thereby improving stability in flight and resulting in longer throws.
用于田径比赛的铁饼 曾经被设计为将重量集中在金属中心处，现在是将其放在边缘，从而提高了飞行的稳定性并导致更长的投掷。
(C) （√）； Designed引导的过去分词结构作定语修饰句子主语 the discus，逻辑正确。
Once designed with…, the discus … is … now lined with…, thereby improving…
原先的设计是将重心放在金属中心处, 而现在是将其放在边缘…
生词:
discus n.(铁饼) 不误认做discuss
Perimeter n. 周边，边缘
考点：
1. 指代一致
2. line: vt. to cover the inner surface of
选项分析:
(A) it指代weight of the discus错误；划线部分is concentrated应该使用过去时态。
(B) it指代问题，同A； According to改变了原文的逻辑意思，原文不是想说根据，只是陈述客观事实。
(D) 全句缺少谓语动词。
(E) design固定搭配，没有design doing的结构； having concentrated 完成时使用没必要； 后半句没有谓语动词， and now 应该为and now is 时态改变，因此不能直接并列，前半句使用的是过去时态was.
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