Passage One [br] Why hasn’t the fur-seal population increased?Because of overfis

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问题 Passage One [br] Why hasn’t the fur-seal population increased?

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答案 Because of overfishing and an ailing ecosystem．

解析第4段以海狗、海狮和海鸟的数量说明本段第2句提到的“从食物链上较高的层次可以看到过渡捕捞和病态的生态环境的迹象”，这就表明，过度捕捞和病态的生态环境是导致海狗数量上不去的原因。

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