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.
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AIn a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is
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BAccording to a previous design, the weight of the discus used in track competition was concentrated in a metal center, but now it is
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COnce designed with its weight concentrated in a metal center, the discus used in track competition is now
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DThe discus used in track competition, once designed with its weight concentrated in a metal center, but now
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EThe discus used in track competition was once designed having its weight concentrated in a metal center and now
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正确答案: C