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】______.
【T16】
选项
答案A
解析 from为介词，后面不能直接跟动词原形，只能选between，意思是“来自于羽毛之间"。
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