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NO.261
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本题平均耗时：4分56秒
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正确率：55%
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题目来源 : 2022高频填空
Select one entry for the blank. Fill the blank in the way that best completes the text.

Thanks to their importance as components in the catalytic converters that reduce vehicle emissions, platinum, palladium, and rhodium have all become                 in the fight against air pollution.

paradigms

aberrations

novelties

bulwarks

exceptions

Select one answer choice.

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