This kind of paper was as soft and light as silk but ______ expensive.

     Paper was one of the most important inventions in the Chinese history. As a result of this invention,
much is known about Chinese history because records were kept on paper. However, in other parts
of the world, much of the history over hundreds of years is completely unknown. As there was no paper
in these countries, no records were kept.
     It is believed that before paper was developed, people in China used to keep records by putting a
number of stones together. As soon as writing came to development, people carved (刻) words on
animal bones. Later, words were carved on metal pots; examples of these have been found from the
sixteenth to the third centuries B.C. Between the second and the fifth centuries A.D. people wrote on
pieces of bamboo or wood and these were tied together to form a book. Although these were much
more useful than the metal pots, they were still difficult to read and were very heavy to carry.
     At the same time another kind of book made from silk was developed. Some silk books that have
been found are over 2140 years old. It was easy to write and draw on silk. The problem was that it
was too hard for everyday use. Because it was so expensive, people developed a kind of paper made
from the fibers of plants. They used fishing nets, barks, pieces of old clothes and so on to make paper.
This kind of paper was as soft and light as silk but much less expensive.

1. Paper was one of the greatest inventions because ______.

A. it was invented by the Chinese
B. it was the first one that was invented by humans
C. it helped to record human's history
D. no other countries used paper except China

2. Which of the following statements is NOT true according to the passage?

A. People wrote words on a piece of wood or bamboo to keep record.
B. Animal bones were used to carve words on by people in the ancient time.
C. Words carved long ago can be found on metal pots even today.
D. Ancient people put stones together to write words on.

3. We may know that ______.

A. silk books were not so widely spread
B. all kinds of paper were invented over 2140 years ago
C. fishing nets and clothes were cheaper than paper then
D. paper made from silk was not so soft to write on