2017年6月大学英语六级阅读理解每日一练（22）
距离2017年6月大学英语六级考试还有一个半月的时间，已经报名的同学备考一定要抓紧，不要临时抱佛脚。新东方网英语六级频道为大家整理了英语六级阅读理解每日一练，每天一道题考试不担心。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(鸽棚) , 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.
21. A 22. C 23. D 24. B 25. C
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