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29.What can we infer about the experiment?A.The participants are mainly British.B.Most of its participants were female.C.The experiment lasted for six years.D.The participants kept a diary every day.30.How did the researchers draw their conclusion?A.By comparing the previous studies.B.By investigating cause and effect.C.By collecting and analyzing data.D.By interviewing various subjects.31.Which can be a suitable title for the text?A.Artificial Sweeteners:a Potential Threat to HeartB.Sugar:a Big Risk to Cerebrovascular DiseasesC.France:a Leading Country in Sugar ConsumptionD.Eating Habits:a Key to Enhancing Your HealthDA smart window that automatically keeps heat in during the winter and lets it out in thesummer could be a cost-effective way to save energy.Windows are one of the least efficient parts of buildings,accounting for as much as 60%oftheir energy loss.In hot weather,windows are warmed up from the outside,radiating heat intobuildings.When it is cold outside,windows are warmed up from the inside and they radiate heat tothe outside environment.This process is called radiative cooling.It means that windows aren'tvery effective at keeping buildings warm or cool as required.In the US,4%of energy use can beattributed to heating and cooling through windows.Yi Long at Nanyang Technological University in Singapore and her colleagues have nowdeveloped a window that can turn this radiative cooling effect on or off by itself,depending on itstemperature.The team added a thin layer of vanadium dioxide-a chemical that changes from aninsulator(绝缘体)to a conductor at around68℃-to one side of the glass.Below thistemperature,the window blocks infrared(红外线的)radiation from escaping,which helps to keepheat inside.Above this temperature,the window allows heat to pass through from the inside andOf course,68C is much higher than even the most extreme heat we feel in the summer,so the teamreflects heat from the outside.added tungsten to the vanadium dioxide to lower the transition temperature to 28C.Between the glass and the tungsten-doped vanadium dioxide,the team inserted a layer of atransparent plastic called PMMA.This enhances the window's insulating properties.While this is a promising proof of concept,the researchers need to make some improvementsbefore the window can be commercially viable,says Long.Improving its durability and itsefficiency at blocking infrared radiation are some of their key considerations.32.What is used to control radiative cooling?A.Vanadium dioxide.B.An insulator.C.Tungsten.D.PMMA.D33.What will the researchers do to their products next?B.Enhance their performance.A.Put them on the market.D.Test their properties.DC.Cut down their cost.34.What does the underlined word"viable"in the last paragraph mean?B.Affordable.C.Available.D.Sustainable.A.Flexible.Hexibleoffodleavalole英语（三）试卷·第5页（共8页）