2. 外语
  3. It is believed that fear______. In Dr. Shumyatsky’s test, the knock-out mice______.

It is believed that fear______. In Dr. Shumyatsky’s test, the knock-out mice______.

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问题 It is believed that fear______.
In Dr. Shumyatsky’s test, the knock-out mice______.
选项 A、made the association between stimuli and behavior.
B、were affected by changes that result from lack of the gene.
C、could associate pleasant stimuli with certain behavior.
D、could not be conditioned to respond to certain stimuli.
答案D
解析
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