with the aquifers and the rock paintings, these three things are all evidence

that the Sahara was once much greener than it is today(Q13), that there were hippos

and probably elephants and giraffes and so on.

13.Not long ago, the Sahara had a different climate. What evidence does the professor mention to support this(3)

● Ancient pollen

● Bones from large animals

● Rock paintings

● Agriculture in ancient Egypt

● Underground water

例3： TPO15 Lecture4教授在课上解释一本看起来平凡无奇的书在拍卖会上拍得天价的真实原因。

TPO-15 Lecture-3

Professor

But in 1998, a book of prayers from the Middle Ages(Q9) sold in an art auction for a lot of

money, more money than anyone would pay for a damaged book from the 12th century. Beautiful or not, why? It had been discovered that the book was a palimpsest, and beneath the surface writing on the manual script laid, guess what? Mathematical theorems and diagrams from Archimedes(Q9)

9. What type of book became known as the Archimedes palimpsest?

A history book.

A physics book.

A prayer book.

An artists book.

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