In the spring of 1926, Yan Qingbao,  a 43-year-old farmer, discovered a circular piece of jade(玉)  
while digging a hole. Driven by curiosity, he dug deeper and found a group of about 400 colourful jade
pieces.
     At the time,  he had no idea that his discovery would be as important as other wonders of the world
such as China's Great Wall and Egypt's pyramids. Since then more than 10000 relics, dating back to
between 5000 and 3000 BC have been unearthed at Shanxingdui. These relics include gold, pottery,
bone tools and ivory objects. They prove that Shanxingdui contains the ruins of an ancient city that was
once thepolitical, economic and cultural center of the ancient Shu Kingdom-the old name for Sichuan.
     It has helped modern historians realize that Sichuan's human history goes back more than 5000 years. And, located on the upper part of the Yangtze River, the site challenges the common. idea that Chinese
civilization rose from a single source-the Yellow River valley.
     Shanxingdui was named the Scientific Education Base for China's Youth in March this year.
     But still, only four of the Shanxingdui Ruins 12 square kilometers have been uncovered.  Who knows
what other big surprises are waiting to be shown to the world.

1. The farmer dug a hole and found a group of about 400 colourful jade pieces because___.

A. he wanted to look for treasure
B. he was curious about it
C. he knew there were many relics in the hole
D. he wanted to be famous for doing so

2. The underlined word "challenge" here means___.

A. change
B. agree with
C. compete with
D. disappoint

3. The main idea of the passage is___.

A. Shanxingdui was named the Scientific Education Base for China's Youth
B. Shanxingdui was once the political, economic and cultural center of the ancient Shu Kingdom
C. the importance of the discovery of Shanxingdui
D. it  has  helped  modern  historians  realize  that Shichuan's human history goes back more than
    5000 years

4. Which of the following statements is NOT true?

A. About 10400 relics have been unearthed at Shanxingdui.
B. The farmer didn't know his discovery would be as important as other wonders of the world.
C. Modern historians realize that Sichuan's human history goes back more than 5000 years.
D. Chinese civilization rose from a single source-the Yellow River valley.