tpo5听力 Astronomy 一小题，求解！！

xuehanyang

15. Why is the South Pole-Aitken Basin thought to be exceptionally old?

A The walls of the Basin are more reflective than those of most other craters

B Testing of rocks from the Basin’s floor proves them to be as old as the Moon itself

C Many small craters have been detected at the bottom of the Basin

D A large amount of dust has been detected in and around the Basin

这篇听力好难呀。。。
听了5遍了，又看了原文，没有听到关于exceptional old 的地方呀。
求大牛帮助！！

zhanguang07

选C吧。文章中有。