Question 24 is based on the passage you have just heard.

​​​​​​​听力原文

    Thanks to the International Space Station, we know quite a bit about the effects of low gravity on the human body, (22) [but NASA scientists want to learn more. To that end, they have been studying how other species deal with low gravity,] specifically focusing on mice. The results are both interesting and humorous.

    The scientists first sent some mice in a specially designed cage to the International Space Station. The cage allowed them to study the behavior of the mice remotely from Earth via video. As you’ll notice in the video, (23) [the mice definitely seem uncomfortable at the beginning of the experiment.] They move around clumsily, drifting within the small confines of the cage and do their best to figure out which way is up, but without success. However, it’s not long before the mice begin to catch on. They adapt remarkably well to their new environment and even use the lack of gravity to their advantage as they push themselves around the cage.

    That’s when things really get wild. (24) [The 11th day of the experiment shows the mice are not just dealing with the gravity change but actually seem to be enjoying it.] Several of the mice are observed running around the cage walls.

    The scientists wanted to see whether the mice would continue doing the same kinds of activities they were observed doing on Earth. (25) [The study showed that the mice kept much of their routines intact, including cleaning themselves and eating when hungry.] 

24. What was observed about the mice on the 11th day of the experiment?

解析：C。录音后半部分说到，实验的第11天显示，老鼠不仅能适应重力变化，而且似乎乐在其中。也就是说，它们已经在新环境中感到自在。C项内容与此表述一致，其中felt at home是对enjoying it的同义替换，故正确答案为C。

错项排除：录音中间部分说到，老鼠是在想尽办法弄清楚哪边是朝上的，并不是想办法从笼子里逃出来，escape在录音中未提及，故排除A项。录音中说到，在实验一开始时老鼠感到很不舒服，到了第11天它们开始适应重力变化，而且似乎还乐在其中。由此可知，老鼠并没有保持它们一开始时的行为，故B项错误。录音最后提到了activities，但此处说的是科学家想看看这些老鼠是否会继续保持它们在地球上时固有的那些行为习惯，并不是说老鼠发现有更多的活动可以尝试，故D项错误。