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【题目】There are about 3,900 wild tigers left in the world and the illegal trade is one of the biggest threats to their (幸存).

【答案】urvival
【解析】句意:在世界上大约剩下3900只野生老虎,非法交易是对它们生存的最大威胁之一。形容词性物主代词后面接名词,故填survival。

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