阅读理解：A group of second-year college students
进入查看：2022-2023学年英语周报高一课标版第35期答案及试题（第三十五期）
A group of second-year college students have discovered hidden writing on a page from a book from the 1500s, using a special camera system they built.
Surprisingly, finding hidden writing on very old documents isn’t all that unusual. In fact, there’s even a special name for documents like this: a palimpsest (再生羊皮纸卷).
Long ago, writing was done on parchment — thin, dried animal skins specially prepared for writing. But parchment wasn’t easy to make and wasn’t cheap. So it became common to erase the old writing off a parchment and then reuse it for another piece of writing. That’s what creates a palimpsest.
The writing erased off the parchment can’t be seen directly, but scientists have learned ways to use special lighting to reveal the original writing. But it’s unusual for young college students to discover palimpsests.
