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 cacti　10　the age of 50 or so,cold-resistant flowers　11　at the top of the plants once a year.These flowers 　12　birds,bats and bees,which come for the honey and for the tasty flowers with their black seeds. 

　　　13　 the splendid saguaro cacti are plentiful in the Southwest,they are unfortunately 　14　.These giant saguaro cacti have great value in landscape gardening,and the thieves can earn thousands of dollars by uprooting and 　15　 them to nurseries(苗圃).To protect these southwestern 　16　,agents for the Arizona Department of Agriculture go around and 　17　the desert.It’s a most important job though a hard one.But without the saguaro cacti,many desert animals would suffer a lack of 　18　 and loss of nesting sites.The Southwest,too,would　19　something of unique importance,since these desert giants have become a 　20　of the dry region. 

　　【语篇导读】本文是一篇环境类的说明文。文章从奇特的形状、生活特性、经济价值等方面介绍了Sonoran Desert(索诺兰沙漠)的标志性植物——树形仙人掌。

　　1.A.general　B.basic

　　C.unique D.lovely

　　答案:C

　　解析:根据下文可知,树形仙人掌有多达50个手形分支,所以形状“独特”,故选unique“独特的”。general“普通的”;basic“基本的”;lovely“可爱的”。

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