2. 考研
  3. A.between B.imitate C.accelerate D.otherwise Phrases: A.enabling the bird to【T13】______ B.it【T14】______could C.would be di

A.between B.imitate C.accelerate D.otherwise Phrases: A.enabling the bird to【T13】______ B.it【T14】______could C.would be di

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问题 A.between   B.imitate   C.accelerate   D.otherwise Phrases:
A.enabling the bird to【T13】______
B.it【T14】______could
C.would be difficult to【T15】______
D.from【T16】______its feathers
    The emperor penguin traps air in its feathers. Not only does this insulate the bird against extreme cold but it also enables it to move two or three times faster than【T17】______. How? Marine biologists have suggested that it does so by releasing tiny air bubbles【T18】______. As these bubbles are released, they reduce friction on the surface of the penguin’s wings,【T19】______.
    Interestingly, engineers have been studying ways to make ships go faster by using bubbles to reduce friction against their hulls (船身).However, researchers acknowledge that further investigation is challenging because "the complexity of penguin’s wings【T20】______.
【T14】
选项
答案D
解析 空格在主谓之间，证明所有的动词选项和介词选项都不符合语法要求。只能选择副词otherwise，意思是“不用羽毛将空气包住的情况下"，otherwise表示与前文相反的情况。
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