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As one of the most brutal predators (食肉动物), killer whales may not fit the image of a cultured creature.
2019年6月四级真题(第二套)阅读 Section A
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As such, different populations of killer whales have had to learn different hunting techniques in order to gain the upper hand over their local prey.
2019年6月四级真题(第二套)阅读 Section A
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like humans, killer whales have colonized a range of different habitats across the globe, occupying every ocean basin on the planet, with an empire that extend from pole to pole.
2019年6月四级真题(第二套)阅读 Section A
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There's no better example of this than killer whales.
2019年6月四级真题(第二套)阅读 Section A