单选题
英语四级
2017-05-17
The high efficiency in swimming of sharks largely dues to its skin.
参考答案
F
答案解析
信息明示题。题干：鲨鱼能够高效游泳主要是因为它的皮肤。题干关键词是high efficiency in swimming和largely dues to its skin。F段提到The biologists discovered that the skin of the shark is the key to the animal’s high efficiency in swimming through the water．与题干吻合，故选F。