Cai Lun invented paper around 2, 000 years ago in China. It is an important invention. Before the invention of paper, people had to remember lots of information or write it on stone, wood, leaves, etc.
Today everyone in the world uses paper. Sharing information is a lot easier with the help of paper.
People use paper every day. Students do homework and keep a diary on paper. .
Alan Turing was born in London, England, in 1912. He attended Cambridge University from 1931 to 1934. Turing was a mathematician（（数学家）and a computer scientist. He created the first design for a modern computer.
Turing wanted to know if a machine could think for itself and trick someone into believing they were having a conversation with another person. In the test, a human talked to two other people through a computer. One was a machine, and the other was a person. .
A. Paper is a great invention.
B. With paper, we can make books and print newspapers.
C. This idea is till used today.
D. This became known as the Turing test.
E. Many people called Turing the father of computer science.
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