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  3. PASSAGE ONE [br] Why hasn’t the fur-seal population increased?Because of overfis

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

游客2023-10-31  60
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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