IELTS reading detail Practice
根據本文，褪黑激素的主要目的是什麼？
Question type: multiple choice · Difficulty: beginner
- A. (A) 增加大腦活動
- B. (B) 幫助身體保持清醒和警覺
- C. (C) 向身體發出信號，告知該休息了
- D. (D) 在大腦中產生藍光
Explanation Preview
Paragraph B explains the function of melatonin. It states that melatonin 'sends a signal to the body that it is time to rest.' This matches option C directly. Options A and B are the opposite of melatonin's function, and option D is incorrect as melatonin does not produce blue light.