2. 外语
  3. It is believed that fear______. The knock-out mice in the experiment______.

It is believed that fear______. The knock-out mice in the experiment______.

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问题 It is believed that fear______.
The knock-out mice in the experiment______.
选项 A、did not avoid places easily reached by predators.
B、would freeze up when they saw cats.
C、were better at remembering past experiences.
D、had abnormal spatial memory.
答案A
解析
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