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27.Why does the author mention a toddler in the last paragraph?A.To indicate he is fond of little babies.B.To imply he misses family read-aloud.C.To suggest he has lost interest in reading.D.To explain he is ready to be a grandparent.CScientists have developed a pioneering 3D-printed device that could speed up patient accessmedicines and reduce the need for testing on animals.Thousands of animals are used in the early stages of developing medicines worldwideyearly,yet many drugs tested on animals don't show any clinical benefit.Now researchers ats:University of Edinburgh have designed a“body on-chip”that perfectly mimic(模仿)howamcie flows through a patient's body.The plastic device means scientists can test drugs tosee how different organs react without the need for testing on live animals.Made using a 3Dpriter,the chip's five parts represent the human heart,lungs,kidney,liver and brain,comected by channels that mimic the human circulatory(system,through which newdrags can be pumped.The plastic device uses PET scanning to produce detailed 3D images showing what's goingo iside the tiny organs."The PET imagery allows us to ensure the flow of new drugs is,"said Liam Carr,the inventor of the device.PET scanning involves injecting tinyamof radioactive compounds into the chip to send signals to a sensitive camera,allowingscientists to better assess the effect of new drugs.Theplaform can be usd to investigate various human diseases.For example,wecoudhave a fatty liver disease model in the device and use this to see how having a diseased liveraffects other organs,and could even combine multiple diseased cell models to see how diseasescan interfere with each other.Car's supervisor,Dr.Adriana Tavares,said linking five organs together on one devicewould help scientists effectively study how a new drug might affect a patient's whole body.We ousyeam about how diseases traditionally perceived to be restricted to an organymcan have diverse effects across other distant organs or different interconnectedsyems"She added:"This device shows really strong potential to reduce the large number ofthare used worldwide for tstn drugs"精品押题卷·英语五第6页（共12页）
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