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18. Accordingto the passage, what happens to homing pigeons when they are about a month old?
A. they kept in a trap
B. they get their wings clipped marked
C. They enter their first race
D. they begin a training program
19. In paragraph 4, the pronoun “it” refers to which of the following?
A. from
B. bird
C. Radar
D. Loft
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