考研英语单项选择题及答案如下：
1. The professor's lecture was so boring that most students ______ it.
A. enjoyed
B. appreciated
C. endured
D. overlooked
答案：C. endured
2. It is widely believed that exercise can ______ mental health.
A. improve
B. worsen
C. neglect
D. ignore
答案：A. improve
3. The author of the novel is well-known for his ______ style.
A. simple
B. complex
C. controversial
D. creative
答案：D. creative
4. In order to save energy, the company has decided to ______ its production processes.
A. optimize
B. simplify
C. expand
D. reduce
答案：A. optimize
5. The ancient castle stood on the hill, ______ against the sunset.
A. looking
B. shining
C. reflecting
D. towering
答案：D. towering
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