英语六级
A． The number will bounce back at a certain point.
B． Whales begin to adapt to new living conditions.
C． The extinction of whales becomes unavoidable.
D． A biological disaster will come to the earth.
解析：该句意为：“当种群被降到临界水平之下时……种群数量自然就会发生螺旋式下降，而且这或许是不可阻挡的。”由此可判断，这种无法停止的下降趋势会导致鲸鱼种群的消亡。故正确答案为C。
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