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DOne CT image of a brain changed science and medicine forever.Hal,the mle hve()ofinstheneror of theh body prvdnnnournd()unlike any before.Today,doctors in the United Ste order more thanms per year.aycomputed tomrCTsreqnty the quickestway o getting handlewhsmyeroproblem.Cn finduhbodconbleeding and more.The tech n give srgnabout what they willinside a patient,and guide treatment for cancer and other diseases."answers so many questions quickly.That's why it'susedsays medical physicistCynthia McCollough of the Mayo Clinic in Rochester,Minn.ACTscan involves thousands of ay measurements taken from multiple angles.Here'show it works:A source of -rays moves around the body,sending a beam ()of radiationthrough bone,blood and tissue,while moving detectors measure the beam that makes itthrough.Different materials in the body absorb X-rays differently.The calcium()in boneactively absorbs X-rays,for example,while soft tissues absorb les.Sowhen the data collctedby the detectors are joined together by a computer,itnform a cross-sectional view of what'sinside based on where X-rays are absorbed more or less.Moving the table holding the patientso that the X-ray beam and detectors slide along the body enables 3-D reconstructions oforgans and other parts.Over the years,scientists have continually improved the technology,making it faster andhigher(resolution(情晰度),and cutting the amount of radiation that patients receive..Theseimproved CT scans have painted ever more detailed landscapes of the human body.It's hardnot to be impressed by the beauty of the inner world that the scans bring to the surface.32.What does the underlined word theads-up in paragraph 3 mean?A.Measure.B.Choiee.C.Forecast.D.Treatment.33.How does CT help surgeons to detect problems?A.By using different materials to absorb X-rays.B.By collecting and sending data to the computer.C.By checking the amount of calcium in the bone.D.By scanning what's inside based on different X-rays absorption.34.Which of the following can reflect the improvement in X-rays technology?A.Lower speed.B.More radiation.C.Higher resolution.D.Fewer details.35.What is the writer'attitude towards CT scans?A.Doubtful.B.Positive.C.Disapproving.D.Indifferent.英语试题第5页(共12页)