Question 23 is based on the passage you have just heard.

Passage Three

听力原文

    After a tough workout or a day full of physical activity, it’s common to find your muscles aching, but where do these pains come from? (22) 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. (23) 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. (24) Repair of damaged cells takes about two days, and afterwards the soreness disappears. (25) Unfortunately, there is little that can be done to relieve muscle soreness. Pain relieving creams don’t work, but a hot shower, or warm bath can provide some relief.

23. What happens when muscles are damaged according to the passage?

解析：A。录音中间部分提到，当身体意识到肌肉受伤时，作出的反应是增加该部位的血流量，体温会随之升高。A项中的blood flow、body heat和increase均为原词复现，表述与录音内容一致，故为正确答案。B项中的关键词Body movements和difficult在录音中并未提及，故排除。C项利用immediately作干扰，但文章说的是修复不会立即发生。C项与此内容相悖，故排除。录音后半部分出现了fragments，但录音说的是身体会输送专门用来分解大块肌肉纤维碎片的细胞，并不是说肌肉受损时会变得支离破碎，故D项错误。