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New species of snakes, however, are much rarer.
2017年6月四级真题(第二套)听力 Section A
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Scientists identified 20 of the one-meter-long snakes during two trips to the Caribbean islands.
2017年6月四级真题(第二套)听力 Section A
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Some animals, such as bears, frogs and snakes, sleep all winter.
2017年6月四级真题(第二套)听力 Section C