Read the passage carefully, then choose the best answer for each question.
TREASURE SHIP
On a beach along the Skeleton Coast, the sand is filled with diamonds. But in April 2008, workers found something very different: a piece of lost history—a shipwreck and its treasure.
The story began when a worker from the nearby diamond mines found a piece of metal on the beach. It was a piece of copper. Soon, they found more copper and many gold coins. The workers then found that these came from the remains of a large ship. The shipwreck was the real treasure.
Archeologists studied the shipwreck. They thought the ship probably came from Portugal about 500 years before. However, it was difficult to find information about it. In 1775, many maps and books about the ships of the time were lost in a fire in Lisbon. "That left a big hole in our history,” says Portuguese archeologist Alexandre Monteiro.
Finally, Monteiro found out that a group of ships left Lisbon for India in 1533. One of them, the Bom Jesus, carried 300 people and a large amount of treasure. The Portuguese sailors planned to use the treasure to buy expensive Indian spices. Archeologists now believe the wreck might be the Bom Jesus. This is because many of the gold coins found were Spanish. Monteiro found an old letter in the Spanish royal archives. The letter said that Spain gave Portugal money for the trip. Two thousand Spanish coins were put on the Bom Jesus. This could explain why so many Spanish coins were found in a Portuguese shipwreck.
So what happened to the ship? The Bom Jesus probably got lost in a storm. Then it smashed into rocks near the coast and sank. There were few human bones found, so the sailors were probably able to get off the ship. But even if they swam onto the beach, they would have found themselves in a strange, distant land. They had no way to get home. They might as well have been on Mars. To this day, no one knows what happened to them.
What is the purpose of the third paragraph ?
A.to describe how a fire destroyed a part of the ship
B.to describe what books and maps were like in the 1500s
C.to explain why it’s difficult to know much about the ship
D.to inform that the ship was named the Bom Jesus