Visitors to the dry, hot Sonoran Desert of the southern Arizona and northern Mexico are amazed at the many－armed giants. They are the saguaro cacti ( 树形仙人掌 ),

　　which gives the landscape its

　　__1__

　　appearance. In the dry desert the saguaro cacti can live for more than 200 years，grow to a

　　__2__

　　of 60 feet，and have as many as 50 arms.

　　More __3__， the saguaro cacti still persist despite the unbearable desert climate. Those that have grown to old age have

　　__4__

　　droughts, freezes, flash floods, and bush fires as well as the

　　__5__

　　caused by groups of rats that eat their seedlings(秧苗). Like all other desert

　　__6____7__

　　water through their long roots.

　　Naturally，the great saguaro cacti are a(n)

　　__8__

　　part of the desert life. Actually the giants may be

　　___9__

　　to many animals, including woodpeckers, owls, doves, bats and insects. In addition，after a saguaro

　　__10__

　　the age of 50 or so, cold－resistant flowers

　　__11__

　　at the top of the plants once a year.These flowers

　　___12__

　　birds, __13__

　　the splendid saguaros are plentiful in the Southwest, they are unfortunately

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