第5部分：补全短文（第46～50题，每题2分，共10分）
阅读下面的短文，文章中有5处空白，文章后面有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。请将答案涂在答题卡相应的位置上。
Conservation or Wasted Effort?
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. （46）
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?（48） Are we losing our sense of what is reasonable and what is unreasonable?
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 one 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 （经……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
46. F47. C48. E49. B50. A
46. 前文说的是The black robin （旅鸫）的现存数量和活动地点。选项F说的是这里成为有The black robin的唯一的地方。所以，选项F 是合适的选项。
47. 后面的一句话说的是：这个想法是为了在附近购买土地作为保护区。所以，选项C是合。
48. 前后句分别为问句，选项E与其共同构成了三个排比的问句结构。所以，选项E是合适的选项。
49. 前句说的是适者生存，后面的一句说的是这是自然法则。选项B说的是那些在竞争中失败的将会很快消失。所以，选项B是合适的选项。
50. 前句说的是人类可以生存的长久。A句说的是有的生物比人类生活的更加长久。所以，选项A是适合的选项。