标题: PREP08年里的一条题 [打印本页] 作者: winzero 时间: 2010-11-24 16:19 标题: PREP08年里的一条题 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
题目释义: Once designed with…, the discus … is … now lined with…, thereby improving…