Why did one scientist expose birds to artificial daylight？A．To test the relationship betwe
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Why did one scientist expose birds to artificial daylight？
A．To test the relationship between daylight and a disease of the glands common to birds.
B．To test the relationship between daylight and migration.
C．To test the relationship between migration and temperature.
D．To test the relationship between daylight and changes in the season.
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正确答案：B
B[注释] 本题依据是第三段首句，关键部分是a relationship between increasing daylight and．．．may prepare them for migration。