英语六级
A． people's growing awareness of the balance between ecology and business
B． their theory which has been derived from life experiences
C． a flexible biological system in which all species survive
D． the change of balance between market need and the amount of whales
解析：该句意为：“……捕鲸者力图通过强调鲸鱼可以自动受保护来为他们卑鄙的勾当正名：鲸鱼一变得稀有，就没有捕捉的经济价值了，那么，人们除了停止捕鲸外别无选择。”由此可判断。捕鲸者认为当鲸鱼数量稀少时，由于不再具备市场价值会被停止捕捉，这样它们通过自然的休养生息，数量会得到恢复，因此鲸鱼的数量是可以通过市场需求调节的。故D项与文意相符，为正确答案。
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