2. 外语
  3. It is believed that fear______. Dr. Shumyatsky discovered that the knock-out mice______.

It is believed that fear______. Dr. Shumyatsky discovered that the knock-out mice______.

admin2009-06-24  11
问题 It is believed that fear______.
Dr. Shumyatsky discovered that the knock-out mice______.
选项 A、had damaged hearing.
B、had low pain sensitivity.
C、were not capable of learning fear.
D、showed instinctive fear when seeing cats.
答案C
解析
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