2017届高考英语（全国）复习练习题：加练半小时第17练自然与环保类（3）（含答案）_高考复习指南

　　，these leafless giants can store water for use during the desert’s long dry season by

　　water through their long roots.

　　Naturally，the great saguaro cacti are a(n)

　　part of the desert life.Actually the giants may be

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

　　the age of 10 or so，coldresistant flowers

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

　　birds，bats and bees，which come for the honey and for the tasty flowers with their black seeds.

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

　　.These giant cacti have great value in landscape gardening，and the thieves can earn thousands of dollars by uprooting and

　　them to nurseries(苗圃)．To protect these southwestern

　　，agents for the Arizona Department of Agriculture go around and

　　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

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