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题目内容双击单词支持查询和收藏哦～
Elephants are known to use a wide variety of calls, many of them infrasonic (below the level of human hearing), in coordinating group behavior, The infrasonic calls usually have a component that is (i)______________, but these higher frequency aspects of the calls (ii)_____________ very quickly with distance, so that in the wild, human observers are often (iii)_____________ sudden coordinated movements of large groups of elephants when no signal was apparent to the observer.
- Blank(i)
- somewhat muted
- distinctly sonorous
- humanly audible
- Blank(ii)
- attenuate
- repeat
- differentiate
- Blank(iii)
- alert to
- ignorant of
- astonished by
humanly audible , attenuate , astonished by 显示答案
以上解析由 考满分老师提供。
