Nauru's real troubles began in 1899 when a British mining company discovered phosphate(磷酸盐) on the island. In fact, it found that the island of Nauru was nearly all phosphate, which is a very important fertilizer for farming. The company began mining the phosphate.

　　A phosphate mine is not a hole in the ground; it is a strip­mine. When a company strip­mines, it removes the top layer of soil. Then it takes away the material it wants. Strip­mining totally destroys the land. Gradually, the lovely island of Nauru started to look like the moon.

　　In 1968, Nauru became one of the richest countries in the world. Every year the government received millions and millions of dollars for its phosphate.

　　Unfortunately, the leaders invested the money unwisely and lost millions of dollars. In addition, they used millions more dollars for personal expenses. Soon people realized that they had a terrible problem—their phosphate was running out. Ninety percent of their island was destroyed and they had nothing. By 2000, Nauru was almost financially ruined. Experts say that it would take approximately $433,600,000 and more than 20 years to repair the island. This will probably never happen.

　　56. What might be the author's purpose in writing the text?

　　A. To seek help for Nauru's problems.

　　B. To give a warning to other countries.

　　C. To show the importance of money.

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