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  3. Researchers have established that when people are mentally engaged，biochemical changes occur inthe brain that allow it to act mo

Researchers have established that when people are mentally engaged，biochemical changes occur inthe brain that allow it to act mo

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问题 Researchers have established that when people are mentally engaged，biochemical changes occur inthe brain that allow it to act more effectively in cognitive areas such as attention and memory．
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答案研究学者已经证实，当人们用脑时，大脑中会发生生化反应，使其在注意力和记忆力这样的认知领域运作效率更高。
解析 句子主干：Researchers have established that…。第一个that引导宾语从句，其中when引导时间状语从句：第二个that引导定语从句修饰changes，it指代brain。
  【语法难点】因修饰关系使定语从句与先行词分割。
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