A. warn people of wildlife extinction
B. appeal more tourists to be involved in
C. attract many unusual and beautiful butterflies
D. improve the economic conditions of local people
答案:C 细节理解题。由第二段第一句话“...aiming to see whether these flowers will interest the rare and beautiful butterflies.”可知,人们种植许多特别花的原因是吸引罕见而美丽的蝴蝶。
73.Butterflies are called “indicator species” because________.
A. they can provide support for visitors
B. they can give information to other species
C. they are not easily found out in their habitats
D. they are very sensitive to environmental changes
答案:D 细节理解题。由第二段第三句话“They are great ‘indicator species’ as they are easily affected by climate changes so they make a brilliant earlywarning system for the environment.”可知,蝴蝶被称为物种标志的原因是因为它们对环境的变化很敏感。
74.Volunteers are required to do the things EXCEPT________.
A. having some special previous experience
B. being interested in protecting the environment
C. walking a regular route and do some recordings
D. visiting the nature protection area once a month
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