In their training flights or in actual races, the birds are taken to prearranged distant points and released to find their way back to their own lofts. Once the birds are liberated, their owners, who are standing by at the home lofts, anxiously watch the sky for the return of their entries. Since time is of the essence, the speed with which the birds can be induced to enter the loft trap may make the difference between gaining a win or a second place.
The head of a homing pigeon is comparatively small, but its brain is one quarter larger than that of the ordinary pigeon. The homing pigeon is very intelligent and will persevere to the point of stubbornness; some have been known to fly a hundred miles off course to avoid a storm.
Some homing pigeon experts claim that this bird is gifted with a form of built-in radar that helps it find its own loft after hours of flight, for hidden under the head feathers are two very sensitive ears, while the sharp, prominent eyes can see great distances in daytime.
Why do homing pigeons fly home? They are not unique in this inherent skill; it is found in most migratory birds, in bees, ants, toads, and even turtles, which have been known to travel hundreds of miles to return to their homes. But in the animal world, the homing pigeon alone can be trusted with its freedom and trained to carry out the missions that people demand.
21. This passage is mainly about_______.
A. homing pigeons and their training
B. how to buy a homing pigeon
C. protection of homing pigeons against the threat of extinction
D. liberation of homing pigeons
22. According to the passage, what happens to homing pigeons when they are about a month old?
A. They are kept in a trap.
B. They enter their first race.
C. They begin a training program.
D. They get their wings clipped and marked.
23. According to the passage, the difference between a homing pigeon and an ordinary one is_______.
A. the span of the wings B. the shape of the eyes
C. the texture of the feathers D. the size of the brain
24. The author mentions all of the following attributes that enable a homing pigeon to
return home EXCEPT_______.
A. instinct B. air sacs
C. sensitive ears D. good eyes
25. Why does the author mention bees, ants, toads, and turtles in the last paragraph?
A. To describe some unusual kinds of pets.
B. To measure distances traveled by various animals.
C. To compare their home-finding abilities with those of homing pigeons.
D. To interest the reader in learning about other animals.
雅思考试备考词汇记忆幸福婚姻的开始婚礼
雅思考试每日词汇累积表示生气的词汇及词组
雅思考试每日词汇累积列车脱轨事故
雅思考试每日词汇累积我们应该珍惜的那些时光
雅思考试每日词汇累积美味日料词汇
雅思考试备考词汇累积动物的孩子都叫什么
雅思考试每日词汇累积照亮生命的光
雅思考试词汇每日累积自行车的结构
雅思考试词汇每日累积烹饪大法
雅思考试备考词汇记忆扑克牌上的词汇
雅思考试每日词汇累积各种人际关系
雅思考试每日词汇累积茶具与茶的种类
雅思考试每日词汇累积各种各样的舞蹈
雅思考试备考词汇记忆中国各大银行的名称
雅思考试每日词汇累积中国传统建筑
雅思考试每日词汇累积资讯报道常见词汇
雅思考试每日词汇累积月食现象
雅思考试每日词汇累积美味健康的蔬菜
雅思考试词汇每日累积各种口味的巧克力
雅思考试词汇每日累积千变万化的红色
雅思考试备考词汇记忆国际知名银行的名称
雅思考试备考词汇记忆奥斯卡颁奖典礼电影类型
雅思考试每日词汇累积吃东西的方式
雅思考试每日词汇累积离婚相关词汇
雅思考试词汇每日累积道路的种类
雅思考试备考词汇累积最美的英文单词
雅思考试每日词汇累积眼中的词汇
雅思考试每日词汇累积与酒有关的表达
雅思考试词汇每日累积童的那些小玩具
雅思考试每日词汇累积指尖的动作
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