[A]vibration [B]inexplicable [C]symposium [D]unlikely [E] terrestrial [F] studied [G] strangely [H] over-l

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问题     [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
    Vibration in the ground is 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 4 vibrations. But, according to researchers who have been meeting in Chicago at a【C5】________of the Society for Integrative and Comparative Biology, this anthropocentric approach has meant that【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】________.
【C3】

选项

答案A

解析 分析句子可知,空格所在句中的第一个that引导表语从句,表语从句缺少动词feel and understand的宾语,所以空格处所填词应为名词,可做宾语。第二个that引导定语从句修饰空格处的名词,表示所填词可以通过地面传输,vibration(震动)符合语义,故答案为A项。
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