题目内容
A rat or pigeon might not be the obvious choice to tend to someone who is sick, but these creatures have some _______ skills that could help the treatment of human diseases.
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________having a brain no bigger than the tip of your index finger, pigeons have a very impressive visual memory.
Recently it was shown that pigeons could be trained to be as accurate as humans at ______breast cancer in images.
Rats are often associated with spreading disease_________ preventing it.
That people often experience trouble sleeping in a different bed in ________surroundings is a phenomenon known as the “first-night” effect.
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