59．What is the best title for the passage?

　　A．How to sleep well

　　B．Why can’t we fall asleep

　　C．Developing a regular sleep cycle

　　D．Sleep habits and health

　　B

　　We all know that when leaves fall to the ground they die and become food for worms. When worms pass the leaves, their waste can help to make the soil rich, from which the plants use to get their nutrition. The plants grow and provide food for animals. When the animals eat the plants, their waste goes back into the soil. It’s a perfect cycle.

　　But at the Elephant Conservation Centre in Lampang, Northern Thailand, they are using elephant waste for something more?to make 100% natural, beautiful colorful paper products! 100 years ago over 100,000 elephants in Thailand worked on farms, building sites and even in the army. However, only 6,000 remain there today because of advances in technology that have made elephants’ old word less necessary. Elephants are doing new jobs now, including entertaining tourists by painting and playing football, and now by helping in the paper making industry. And their keepers, called Mahouts, can earn a living for their families and help their elephants by using elephant waste, also called “dung” to make beautiful, natural, paper products without any bad smell.

　　Every day an adult elephant eats about 200kg of plants like bamboo, grass and watermelon seeds. His body system breaks the plants into 50kg of fibers, which can produce 115 sheets of fibrous paper.

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