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We had a geography lesson about the Sahara in last week. It's a large desert,the world largest,in fact. It is near equal to the United States in size and cover more than 9 million square kilometers. It is more than 4,600 kilometers from east to west but 1,600 kilometers from north to south. The Sahara has a very dry climate. An average annual rainfall is not even 10 centimeters,and worse still,many areas received less than 2 centimeters per year. There is few surface water in the Sahara. The Nile river does running across the Sahara,and there are some green places,but the surface is still dry. Of the green places in the Sahara,about 90%of them are large enough support tiny villages.

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   The New Caledonian barrier reef (堡礁) is located in New Caledonia in the South Pacific, and is the second longest coral reef in the world, after the Belize Barrier Reef.

The New Caledonian barrier reef surrounds Grande Terre, New Caledonia’s largest island, as well as the lie des Pins and several smaller islands, reaching a length of 1,500 km. The reef encloses (围住) a lake of 24,000 square kilometers, which has an average depth of 25 meters. The reefs lie up to 30 kilometers from the shore, but extend almost 200 km to the Entrecasteaux reefs in the northwest. This northwestern extension encloses the Belep Islands. Several natural passages open out to the ocean. The Boulari passage, which leads to Noumea, the capital and chief port of New Caledonia, is marked by the Am6d6e lighthouse. The reef has various species, and is home to endangered dugongs, a kind of sea animal, and is an important living site for green sea turtles.

Most of the reefs are generally thought to be in good health. Some of the eastern reefs have been damaged by waste water from nickel mining (镍开采) on Grande Terre. The waste from mining and agriculture has affected reefs near river mouths, which have been worsened by the destruction of forests, which help to keep waste. Some reefs have been buried under several meters of waste.

In January 2002, the French government proposed listing New Caledonia’s reefs as a UNESCO World Heritage Site. Later on, UNESCO listed the New Caledonian barrier reef on the World Heritage List on 7, July 2008.

【小题1】What can be learned according to the passage?
A.New Caledonia only has one large island named Grande Terre.
B.The New Caledonian barrier reef is 25 meters under the sea surface.
C.Noumea is the chief port of Grande Terre.
D.The Belize Barrier Reef is the longest coral reef in the world.
【小题2】If you travel to the New Caledonian barrier reef with a travel agent, your guide may tell you that __________ .
A.dugongs are well protected from being endangered
B.the Boulari passage is famous for the Am6dee lighthouse
C.the green sea turtle is in danger because of the pollution
D.human beings take no measures to protect the environment here
【小题3】Some of the New Caledonia’s reefs have been damaged mainly because of __________ .
A.humans’ activitiesB.natural disasters
C.the earth’s movementD.their own development
【小题4】Where is this article most probably taken from?
A.A geographical report.B.A newspaper.
C.A travel guidebook.D.A fashion magazine.