综合类:补全短文Conservation
The black robin(旅鸫)is one of the world’s rarest birds.It is a small，wild bird，and it lives only on the island of Little Mangere，off the coast of New Zealand.In 1967 there were about fifty black robins there;in 1977 there were fewer than ten.
Energetic steps are being taken to preserve the black robin.——(47)The idea is to buy another island nearby as a special home，a“reserve”，for threatened wild life，including black robins.The organizers say that Little Mangere should then be restocked(重新准备)with the robin’s food.Thousands of the required plants are at present being cultivated in New Zealand.
Is all this concern a waste of human effort? what is reasonable and what is unreasonable?_____ (48)Are we losing our sense of In the earth’s long，long past hundreds of kinds of creatures have evolved，risen to a degree of success and died out.In the long，long future there will be many new and different forms of life.Those creatures that adapt themselves successfully to what the earth offers will survive for a long time._____ (49)This is nature’s proven method of operation.
The rule of selection--“the survival of the fittest”—-is the one by which human beings have themselves arrived on the scene.We，being ode of the most adaptable creatures the earth has yet produced，may last longer than most._____ (50)You may take it as another rule that when，at last.human beings show signs of dying out，no other creature will extend a paw(爪)to postpone our departure.On the contrary， we will be hurried out.
Life seems to have grown too tough for black robins.I leave you to judge whether we should try to do anything about it.
A Some creatures，certain small animals，insects and birds，will almost certainly outlast(比……长久)man，for they seem even more adaptable.
B Those that fail to meet the challenges will disappear early.
C Detailed studies are going on，and a public appeal for money has been made.
D Both represent orders in the classification of life
E Is it any business of ours whether the black robin survives or dies out?
F These are the only black robins left in the world
答案解析
46.正确答案为F.这篇文章的主题是保护珍稀物种。文章第一段讲到，离新西兰不远的一座岛上生活着一些黑旅鸫，这些鸟已经不多了，1967年时还有50多只，1977年的时候还剩10只。选项F的意思是：这是世界上仅存的黑旅鸫了。逻辑上讥这两句话的意思是讲得通的，these就指前面的black robins，故答案为F.
47.正确答案为C.第二段第一句说，人们正采取一些积极的办法来保护这种鸟类。采取什么办法呢?选项C说，一方面详细的研究工作正在进行，另一方面人们已经募集了许多钱来从事保护工作。选项c正是对本段第一句的说明或解释，故选项C为正确答案。
48.正确答案为E.选项E是一个问句，第三段中的第一句和最后一句也是问旬。根据这个线索我们也可以做出正确选择。选项E的意思是说，黑旅鸫消失或是保存下来关我们什么事吗?把它放到原文中去，意思连起来顺畅，故选E.
49.正确答案为B.文章第四段主要在谈地球上的万物都遵循优胜劣汰，适者生存的的规律。选项B就是这个意思。注意这里的“those”指代的是those creatures.
50.正确答案为A.这一段还在谈适者生存的规律，其中提到地球上的人类可能比某些物种存活的长久，选项A则说的是，有些物种(一些小动物、昆虫或鸟类)却比人存活的更久。此旬意思可以和前面的意思连得上，所以选A.