题目内容:
Researchers at the Max Planck Institute of Animal Behavior and the Universityof Konstanz found that_______.
A.highly sensitive instruments were not useful to detect accelerated movements of an earthquakes B.increased activity of farm animals before an earthquake demanded further research
C.farm animals' normal daily movements can be severely disrupted in a confined spaceimals
D.the unusual behavior of insects proved to be a dependable indicator of potential
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