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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】There can be few more depressing stories in the entire history of man’s exploitation of nature than the destruction of the unfortunate great whales. The whales have not only suffered untold cruelty bu...
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