今天小编为大家分享的是英语四级听力的原文和练习题，文章包含了答案和解析，可以帮助大家跟好的学习，希望通过这篇文章的学习对你们有所帮助，下面跟随小编一起学习吧。
Passage 3
After tough workout or a day full of physical activity, it’s common to find your muscles aching, but where do these pains come from? According to a German professor, the soreness comes from straining your muscles in an uncommon way, for example, jumping on a bicycle for a ride, because you haven’t ridden in a long time. Soreness occurs since your leg muscles aren't used to that movement. When muscles perform an activity they aren’t regularly expose to, the tiny fibers that are inside them are being torn apart. As muscle soreness develops, the body has to work to repair the muscle tears, but this doesn’t happen immediately. First, the body must realize the muscles are damaged. When the body realizes the muscles are hurt, the response is to increase blood flow to the area and increase body heat, damaged cells are then cleaned up and the body sends cells specially designed to break down the large muscle fiber fragments. Healing can take place after this. It takes about a day until these cells make it to your aching muscles. That’s why there is most often a delay associated with muscle soreness. Repair of damaged cells takes about two days, and afterwards the soreness disappears. Unfortunately, there is little that can be down to relieve muscle soreness. Pain relieving creams don’t work, but a hot shower, or warm bath can provide some relief.
Questions 22-25 are based on the passage you have just heard.
22. What does the German professor say about muscle soreness?
23. What happens when muscles are damaged according to the passage?
24. How long does it take for damaged cells to heal?

25. What does the speaker suggest one do to relieve muscle soreness?
22. C, it happens when people engage in an uncommon activity
23. D, blood flow and body heat increase in the affected area
24. A, about two days
25. B, have a hot shower