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外语
PASSAGE ONE Why hasn’t the fur-seal population increased?
PASSAGE ONE Why hasn’t the fur-seal population increased?
admin
2016-12-06
45
问题
PASSAGE ONE
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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0
专业英语四级
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