《2025年暑假活动实践与思考七年级合订本》

四、阅读理解

Do you feel sleepy on rainy days? If the answer is yes, you are not alone. Many people feel the same way. But do you know why?
One of the reasons is that there is little sunshine on rainy days. Our brain will have less serotonin(血清素) and more melatonin(褪黑素) if there is not enough sunlight. Serotonin helps us feel good and energetic, while melatonin makes us feel sleepy. As a result, we may want to go to sleep and even feel a bit sad when it is rainy.
The humidity(湿度) of a rainy day is another reason. As it rains, the air becomes wetter than usual. It's more difficult for our sweat(汗水) to dry in the weather like this, so our body has to work harder to stay cool. This can make us feel tired.
Moreover, the sound of rain, a type of pink noise, will make us feel sleepy too. Like white noise, pink noise includes all the sound frequencies(频率) humans can hear, but it has fewer high frequencies than white noise. This makes pink noise sound softer. Studies show that people's brainwaves(脑电波) will become fewer when they hear pink noise, so they will fall asleep more easily.
Now you can understand why you are sleepy on rainy days. Then what can you do if you don't like that feeling? Well, you can get as much natural light as possible and keep yourself busy. Also, you can use a machine to make your room dry. In this way, you won't feel sleepy any more.
(A)21. How does the writer start the passage?
A. By asking questions. B. By telling a story.
C. By using pictures. D. By giving a weather report.
(B)22. What does the underlined word "energetic" probably mean?
A. Cold. B. Active. C. Tired. D. Unhappy.
(B)23. What change in the air on rainy days makes people feel tired?
A. Temperature drops. B. Humidity increases.
C. Sunlight becomes stronger. D. Wind speed increases.
(B)24. What is the main difference between pink noise and white noise?
A. Pink noise is harsher(刺耳的).
B. Pink noise has fewer high frequencies.
C. Pink noise is louder.
D. Pink noise does not include all the sound frequencies.
(C)25. What is the passage mainly about?
A. Some facts about different kinds of noises.
B. The reasons why people need enough sleep.
C. The reasons why people are sleepy on rainy days.
D. Some ways to help people sleep better on rainy days.

答案： 21. A 22. B 23. B 24. B 25. C