Vibrations in the ground are a poorly understood but probably widespread means o

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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 [br] 【C1】

选项

答案 D

解析 unlikely，上下文题。根据词性，此处应当填入形容词。下文指出“But it is possible．”上下文两句之间为转折关系，可见上文应当认为动物能感知地震的前兆是不可能的，故符合文意的选项为unlikely。

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