The Galapagos Islands are in the Pacific Ocean, off the western coast of South America They are a rocky, lonely spot, but they are also one of the most unusual places in the world.  One reason is that they are the home of some of the last giant tortoises（乌龟）left on earth.
Weighing hundreds of pounds, these tortoises go slowly around the rocks and sand of the islands.  Strangely, each of these islands has its own particular kinds of tortoises.  There are seven different kinds of tortoises on the eight islands, and each kind is slightly different from the other.
Hundreds of years ago, thousands of tortoises were around these islands.  However, all that changed when people started landing there.  When people first arrived in 1535, crews would seize as many tortoises as they could. They would roll the tortoises onto their backs when they were brought onto the ships. The tortoises were completely helpless once on their backs, so they could only lie there until used for soups and stews.  Almost 100,000 tortoises were carried off in this way.
The tortoises faced other problems, too. Soon after the first ships, settlers arrived, bringing pigs, goats, donkeys, dogs and cats. A11 0f these animals ruined life for the tortoises. Donkeys and goats ate all the plants that the tortoises usually fed on, while the pigs, dogs and cats ate thousands of baby tortoises each year. Within a few years, it was hard to find any tortoise eggs-or even any baby tortoises.
Finally, in the 1950s, scientists decided that something must be done. The first part of their plan was to remove as many cats, dogs and other animals as they could from the islands. Next, they tried to make sure that more baby tortoises would be born; This slow, hard work continues today, and, thanks to it, the number of tortoises is now increasing every year. Perhaps these wonderful animals will not disappear after all
What can we learn from Paragraph i?

A．The Galapagos Islands are the biggest islands in the Pacific Ocean

B． The giant tortoises have all left the Galapagos Islands already.

C．The giant tortoises made the Galapagos Islands unusual places.

D．People have built many homes for the giant tortoises on the islands.

What is special about the tortoises according to Paragraph 2?

A．They weigh hundreds of pounds.

B．They move around very slowly.

C．There are different kinds of tortoises.

D．They are larger than the ones in other places.

What happened first?

A．Sailors took tortoises aboard the ships.

B．Scientists decided to take measures to protect the tortoises.

C．Pigs, dogs and cats ate many baby tortoises.

D．Settlers brought other as to the islands.

What happened soon after people brought animals to the islands?

A．Tortoise eggs were kept in safe containers.

B．The animals ate the tortoises' food and eggs.

C．The tortoises continued to wander freely.

D．The tortoises fought against the other animals.

What's the result of the scientists' effort?

A．The tortoises began to disappear gradually.

B．The number of tortoises began to decrease

C．Scientists took away other animals off the islands.

D．There are more and more giant tortoises on the islands.