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It may make sense to use a fan to improve indoor air quality.For instance,you might place one near an openwindow to help exhaust indoor air to the outdoors.●38The second thing you can do is called source control,which is keeping sources of pollutants out of the indoorenvironment if you can,says Pruitt.It can be as simple,Pruitt says,as leaving your dry cleaning outside long enough to air the harmful chemicalsout.Cleaning your home is helpful.But Pruitt warns that "39."She advises,"Read the labels and selectsafer products when you can."●Purify the airFinally,if necessary,the third thing you can try to improve your air is purification.For instance,if you want toremove airborne particles like smoke,dust and germs,40."For homes with air conditioners,"says Pruitt,"you have a purifier that you're supposed to be changing regularly."A.Prevent the air pollutionB.Control the source of the pollutantsC.you should focus on the air qualityD.The first has to do with ventilation(通风)E.Here's how to keep your home's air cleanF.it may make sense to use an indoor air purifierG.Use of harsh cleaning supplies can introduce its own risks第三部分语言知识运用（共两节，满分30分）第一节完形填空（共15小题：每小题1分，满分15分)阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。Being vulnerable (is not a choice.In our life it is a 41.What we do with vulnerability caneither 42 doors to deeper connections,or build walls that prevent progress and fulfillment.Vulnerability 43 the state of being exposed to the possibility of being harmed,either physically oremotionally.It's part of human 44 because we are vulnerable in some way at all times.We are vulnerableto viruses,accidents,misunderstandings and pains caused by whatever reasons.The only 45 we really haveis whether to 46 it or not.When some people claim that they have no vulnerability,they are47 to develop meaningful socialconnections with others.They are just 48.No one likes to spend much time with people who are dishonestor 49 to open up their feelings.Most of the time,a great 50 starts by exchanging each other'svulnerability.Indeed,it's not easy for us to admit our vulnerability in front of others.In order to protect ourselves,we tend to51 with fear.But in fact,when we are vulnerable with people,we have signaled that they can also 52share their anxieties.And we don't have to worry too much about the results because a far more common reactionof people is to respect our 53 instead of laughing at us.Under this shared circumstance,we become less54 by vulnerability and also we strengthened a(n)55.