160.(OG12-23) 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. A. In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is B. According to a previous design, the weight of the discus used in track competition was concentrated in a metal center, but now it is C.Once designed with its weight concentrated in a metal center, the discus used in track competition is now D. The discus used in track competition, once designed with its weight concentrated in a metal center, but now (C) E. The discus used in track competition was once designed having its weight concentrated in a metal center and now
正确答案是C 想问两个点, 一、语法笔记里之前说过 物主代词在前面的时候不是不能代指的吗??? His mother talked with Joe's father. 意思是 someone else's mother talked with Joe's father. 为什么这里its就可以代指discus了?? 二、A 里面的it 为什么不能代指weight of the discus??? 句子意思: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 将其中心放在边缘处不对吗??
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