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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。
A.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。==>出现it要想两个点①it到底在指代什么②it的指代是否有逻辑意义
B.according to用得不够地道 according to通常是指 |通过/根据某个东西，了解 知道什么|，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”。
这个错误太傻逼了
选项e的错误在于如果并列了，那就成A was xxxxx，and was now xxxxx了
我以为“is lined……”的主语是weight
时态
1.it 的指代，倾向于指代主语，名词短语的核心词 weight，这里是discus is lined with 铅在边缘
2.时态
3.according to 意思不对
4.be designed for/as/with 没有直接加doing
5.时态不同，不能并列省略be，要补出be
老师C选项中：once designed with its weight concentrated in a metal center是伴随状语，其主语为the discus；
如果理解为，过去分词做定语，修饰主语discus可以吗？ 感觉这里做定语修饰名词，还是状语修饰动作，很模糊啊...
Line discus with lead用铅line铅球not用铅line重量
哦我知道了~~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
and 后面一样的谓语动词不能省略么……
是因为以前的disc和现在的disc不是同一个disc 所以，不能用it来指代吗？
选项A it 指代weight of the discus错误。划线部分，is concentrated应该使用过去时态
选项B，according to 改变了原文的逻辑意思，原文只是陈述客观事实，不是想说根据
选项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
选项D 缺少谓语动词
选项E designed having 错误，后半句没有谓语动词，若有应该为and now is，前后时态不一样也不能直接并列
同选B。。。