2. 外语
  3. What is the main idea of this passage? Electrical impulses affect ______.

What is the main idea of this passage? Electrical impulses affect ______.

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问题 What is the main idea of this passage?
Electrical impulses affect ______.
选项 A、long-term memory
B、short-term memory
C、structural changes
D、brain cells
答案B
解析 本题是道细节题。本题答案的选择依据在文章最后一段： Short-term memory involves electrical impulses since at a temperature where electrical activity ceases，there is no memory. Long-term memory，in contrast, is unaffected by the disruption of electrical activity and may involve structural changes in brain cells．B项是符合本题要求的正确选项。
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