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We work together to achieve our common purpose: _______ world that is safer, cleaner and healthier than_______ one we are living in.
A.the;/B.a; /C.the; theD.a; the
D

试题分析:句意:我们一起工作以实现我们共同的目标:一个比我们现在生活的世界更健康更干净更安全的世界。不定冠词a/an表示某一类人或某事物中的任何一个,经常用在第一次提到某人或某物时,用不定冠词起介绍作用,表示一个。a用于辅音音素前an用于元音因素前。定冠词特指某(些)人或某(些)事物, 以区别于同类中其他的人或事物。根据句意,可知第一个世界表示类别,第二个特指,故选D。
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