标题：Early Birds and Night Owls

正文：
Many people believe that waking up before sunrise is the secret to success. They argue that early risers get a head start on the day, feeling more focused and productive than those who stay up late. However, this belief may ignore the fact that human bodies differ greatly in their natural rhythms.

Research on chronobiology suggests that a person's preferred schedule is partly determined by genetics. Night owls often think more clearly in the evening, while early birds peak in the morning. What matters most is not when you sleep, but whether you sleep enough and keep a steady routine.

In the end, the most successful schedule is the one that fits your life. Instead of forcing yourself to rise at five in the morning, listen to your own body clock and plan demanding tasks during your natural peak hours.

题目：
1. What do many people believe about waking up early?
A. It helps people avoid making mistakes.
B. It is the key to becoming successful.
C. It makes people sleep less at night.
D. It is only suitable for young people.
答案：B
2. According to the research, what determines a person's preferred schedule?
A. The amount of daily exercise.
B. The place where a person grows up.
C. Genetics and natural body rhythms.
D. The habit of drinking coffee.
答案：C
3. What is the writer's main advice in the passage?
A. Wake up early no matter what.
B. Follow a schedule that suits your own body clock.
C. Sleep more during the daytime.
D. Avoid demanding tasks completely.
答案：B