IELTS Reading detail Practice
According to the passage, what is the main purpose of melatonin?
Question type: multiple choice · Difficulty: beginner
- A. To increase the brain's activity
- B. To help the body feel awake and alert
- C. To signal to the body that it is time to sleep
- D. To produce blue light in the brain
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.