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.
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