Sixty­six of the big cats can be found in the cages of a dozen zoos around China.But they are nothing like their wild cousins.They have lost their natural skills such as hunting and killing.If they were set free they could not look after themselves.

　　“Breeding has damaged the quality of the species”， said Pei Enle, deputy director of the Shanghai Zoo.

　　To reintroduce the species into the wild, the country started a programme to send five to ten young tigers to South Africa.Four of them have already arrived.Progress has been made as two elder tigers have recovered some of their instincts(本能) and can hunt wild animals by themselves at the African base.

　　“South Africans are very experienced in reintroducing big animals to the wild.The country has very good natural conditions for the tigers to learn in”， said Lu Jun, office director of the National Wildlife Research and Development Center.“We tried in Fujian Province, but it was not successful as there was not a complete eco­chain(生物链) and there was a lack of space.”

　　The tigers should return to China in 2007 when the reservations in Fujian are ready.

　　文章大意：由于过度杀猎和栖息地的丧失，华南虎已经成为十大濒危物种之一。本文介绍了一项让华南虎重获野性、重回大自然的计划。

　　71．What is the main reason for the South China tiger becoming one of the world's top ten most endangered species?

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