大學英語六級考試完形填空臨考沖刺
英語是現在世界上用的最多的一門語言，許多國家都在學英語和用英語，所以，學好了英語，出門就不怕溝通不方便了。下面是小編為大家搜索整理的英語六級輔導訓練，希望能給大家帶來幫助!
Homing pigeons are placed in a training program from about the time they are twenty-eight days of age. They are taught to enter the cage through a trap and to exercise above and around the loft(鴿棚) , and gradually they are taken away for short distances in willow baskets and released. They are then expected to find their way home in the shortest possible time.
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.
參考答案
21. A 22. C 23. D 24. B 25. C
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