题目内容
A 9-year-old girl in New Mexico has ______more than $500 for her little brother who needs heart surgery in Houston Texas this July.
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We have Quartz crystal clocks and watches accurate to_____ one minute a year.
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.
________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.
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