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cOne major issue in contemporary medical science is the use of humans in clinical trials of medicalproducts.These trialsocfrequenty to determine the best way to manage diseases.People are invited randomly and paid to take part in trials of an experimental drug,or new surgicalproedre,in a number of counries at the one time.For example,up to a quarter of patients nmefields like breast cancer may be engaged.Other projects,one of which is to determine whether newscanning techniques can detect Alzheimer's disease,are under way.They may be given the drugor aplacebo(安慰a剂)，or the best existing treatment,and results compared..The trials may be“blind”withthe patient not knowing which group they are in or they may be a"double-blind"with the doctors notknowing either.Actually,so many people offer themselves willingly.Patients take the views that at least they willget special attention from the doctor if they participate and they may get access to new drugs before theybecome available in chemists'shops.In some countries people are paid to participate,especially inpoorer countries where they may be told little of what is actually happening.Yet there are significant risks too.One US study estimated that one in 30 people suffered sideeffects from such trials,and one in 10,000 dies.Doctors say that the risk is not so great during the trialitself,where patients are closely monitored,but comes when the drug is released on the market place.For example,in 2004 a US company recalled an arthritis drug,when it was found that after 18 months ofuse,the risk of heart attack and stroke increased.People who support testing claim the risks to the individual are small compared with the benefits.Even if the individual has adverse outcomes and their condition worsens,that is valuable informationfor the drug company.While the drug companies usually pay for the hospital trials,government has setup medical committees to handle the issue.8.What is the main idea of the second paragraph?A.The purpose of medical trial.B.The procedure of medical trial.The groups of medical trial.D.The result of medical trial.9.Why does the author mention the example in the fourth paragraph?A.To tell us a lot of patients die from the medical trials.B.To show the risk of heart attack and stroke has increased.C.To introduce the risks of the medical trials are not so great.D.To explain the risks of some drugs appear when they are sold.潮州市二模英语试题第4页（共10页）