在深入研读郭崇兴考研英语讲义的基础上，以下是对部分题目的原创解答：
1. 题目：The author suggests that the best way to improve memory is ________.
答案：by practicing regular mental exercises.
2. 题目：According to the passage, which of the following is NOT a factor that affects memory?
答案：The color of the classroom walls.
3. 题目：The passage primarily discusses ________.
答案：strategies for enhancing memory retention.
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