【題目】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：在世界上大約剩下3900只野生老虎，非法交易是對(duì)它們生存的最大威脅之一。形容詞性物主代詞后面接名詞，故填survival。

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