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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
2024-08-30
2
管理
问题
Passage One [br] Why hasn’t the fur-seal population increased?
选项
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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