Li was studying diseases in a mountainous region of northwest China when he first discovered the 8-inch mammal in 1983.3.　 In 1985,he found two more pikas.When researchers at the Chinese Academy of Sciences took a closer look at Li’s discovery,they confirmed that it was indeed a new species. 

　　In the early 1990s,scientists estimated(估计) that there were about 2,000 Ili pikas running across mountain cliffs in China.Now there are probably fewer than 1,000.Li thinks that the Ili pika population has decreased by nearly 70 percent since he saw the first one in 1983.

　　“This tiny species could be extinct anytime,”Li said.“4.　” 

　　Big changes to the Ili pika habitat are probably contributing to the pikas’ lower population.In addition,Ili pikas don’t reproduce often,and other animals are eating grass where they live.Changes in local temperatures have driven Ili pikas to higher elevations(海拔) in the mountains.

　　Li and others are encouraging wildlife groups to help protect this creature.Li searches full-time for Ili pikas.5.　 Li is also working to create a wildlife reserve to help protect Ili pikas. 

　　A.It became endangered soon.

　　B.They finally spotted one last summer.

　　C.Lots of animals were discovered in the mountains.

　　D.Li didn’t know what it was,and neither did the locals.

　　E.Only three dozen of them have ever been seen by people.

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