It is believed that fear. Dr. Shumyatsky discovered that the knock-out mice.

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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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