Question 21 is based on the recording you have just heard.

21. What was the problem with the material the speaker worked on at a New York fashion house?

解析：C。本题目为细节题。问题为：讲话人在纽约的时尚店工作时材料有何问题？原文所在句：But I had a few problems with them.They were made from hard plastics and that’s why they were very breakable.对于这些材料，确实有一些问题，它们用坚硬的塑料制成，这就是为什么它们非常易碎。选项C) It was hard and breakable（它们非常坚硬易碎），与文中信息一致。其他选项干扰较小，属于无中生有。