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, cold­resistant 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 saguaros are plentiful in the Southwest, they are unfortunately __14__. These giant 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.

　　语篇解读：本文是一篇说明文。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

　　解析：选C　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”。

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