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  3. Vibrations in the ground are a poorly understood but probably widespread means of communication between animals. It seems【C1

Vibrations in the ground are a poorly understood but probably widespread means of communication between animals. It seems【C1

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问题     Vibrations in the ground are a poorly understood but probably widespread means of communication between animals.
    It seems【C1】________ that these animals could have detected seismic "pre-shocks" that were missed by the sensitive vibration-detecting equipment that clutters the world’s earthquake laboratories. But it is possible. And the fact that many animal species behave【C2】________ before other natural events such as storms, and that they have the ability to detect others of their species at distances which the familiar human senses could not manage, is well established. Such observations have led some to suggest that these animals have an extra sense. The best guess is that they can feel and understand【C3】________ that are transmitted through the ground.
    Almost all the research done into animal signaling has been on sight, hearing and smell, because these are senses that people possess. Humans have no sense organs designed specifically to detect【C4】________ vibrations. But, according to researchers who have been meeting in Chicago at a【C5】________ of the Society for Integrative and Comparative Biology,【C6】________ via vibrations of the ground (a means of communication known as seismic signaling) have been almost entirely【C7】________ . These researchers believe that such signals are far more common than biologists had realized — and that they could explain a lot of otherwise【C8】________ features of animal behavior.
    A seismic sense could help to explain certain types of elephant behavior. One is an apparent ability to detect thunderstorms well beyond the range that the sound of a storm can carry. Another is the foot-lifting that many elephants display prior to the arrival of another herd. Rather than【C9】________ the horizon with their ears, elephants tend to freeze their posture and raise and lower a single foot. This probably helps them to work out from which direction the vibrations are【C10】________  .
    A. vibration      B. inexplicable      C. symposium      D. unlikely
    E. terrestrial    F. studied           G. strangely      H. over-looked
    I. travelling     J. interactions      K. shakings       L. scanning
    M. shockingly     N. studying          O. conference
【C7】
选项
答案H
解析 上下文题。根据词性，此处应当填入动词被动式。根据上文“Almost all the research done into animal signaling has been on sight，hearing and smell，because these are senses that people possess．”可见人类的研究主要集中在视觉、听觉和嗅觉，因此可推断出对于地面震动的感觉的研究基本上被忽略了。
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