Unit 1 Science and scientists 单词练习（ppt课件）-2024新人教版（2019）《高中英语》选择性必修第二册.pptx

1、 人教选二Unit 1Science and scientistslearn the words in the passage Since the severe COVID-19 broke out,many people all over the world have been infected.Chinese outstanding,gifted and patriotic specialists in epidemiology and their assistants have been in charge of tracing the source of the virus in or

2、der to defend more people from being killed.They desired to produce vaccine to handle the deadly disease once and for all.Initially,with concrete proof collected,they suspected that wild bats were to blame.But by observaing the virus with microscopes,they gathered solid and multiple statistics and m

3、astered the framework of the virus,which gradually transformed their intial contradictory thinking.All the findings made them suscribe to the idea that the virus was not directly linked to the bats,which made the brilliant experts frustrated.This also cast a shadow on the experts,so they had to shif

4、t towards how to prevent the virus from spreading among people.Above all,the less we go out,the less likely we will come down with the deadly disease.Furthermore,taking in more protein and eating more vegetables are good choices as well.Last but not least,what we should do is that we must wear masks

5、 outdoors.Thanks to these interventions,the threat of COVID-19 in China saw a susbtantial decrease.What we have experienced has taught us to lead a healthy life such as drinking pure or boiled water and avoiding raw food.In conclusion,under our motherlands leadership,we have achieved steady success,

6、tears of happiness pouring down our cheeks.practice again1 cholera2 diarrhoea3 dehydration4 contradictory5 germ6 pump7 water pump8 household9 raw10 statistic11 epdemiology12 microscope13 protein14 cell15 virus16 vaccine17 framework18 theoretical framework19 rainbow20 concrete21 plasma22 aerospace23

7、patriotic24 mechanical25 mechanic26 aviation27 jet28 missile29 astronomy30 telescope31 severe32 idiom33 ignore34 initial35 solid36 shadow 37 subscribe38 suspect39 blame40 handle41 link42 substantial43 decrease44 transform45 thinking46 finding47 cast48 pour49 leadership50 immigration51 impression52 i

8、ncorrect53 import54 illegal55 immediately56 trace57 outstanding58 abstract59 concept60 besides61 brilliant62 furthermore63 fault64 shift65 frustrated66 infection67 infectious68 frustrate69 defend70 proof71 prove72 intervention73 multiple74 multiply75 intervene76 assistant77 gifted78 steady79 vivid80

9、 once and for all81 subscribe to82 thanks to83 break out84 in charge of85 come down86 above all87 die from88 die of89 in time90 be likely to do81 after all82 in all83 be to blame84 come up with85 come across86 come out Reading comprehension Can graphene(石墨烯）in your clothing stop mosquito bites?With

10、the weather getting hot,bites caused by mosquitoes not only annoy people,but can result in many infectious diseases.Even when people wear long clothes,mosquitoes complex biting mechanism enables them to bite some of them through.It would be great if clothing could be used to completely prevent peopl

11、e from getting betten.Researchers tested graphene,a material that is incredibly thin but really strong,in order to find out if it can make clothing resistant to mosquitoes.In the lab experiment,volunteers exposed a small patch of skin on their arm or hand to roughly 100 mosquitoes for five minutes a

12、t a time.Researchers tested three different situations:volunteers wearing no protection,wearing cheesecloth(薄纱棉布）,or wearing cheesecloth plus a thin graphene layer under it.A video camera was then used to record and quantify mosquitoes behavior,including whether they landed on the skin,how long they

13、 stayed there,and whether they began to suck blood.The number of bites each volunteer got was also calculated based on how many swellings developed on their skin afterwards.Finally,researchers dropped a little water or sweat on top of the graphene layer and studied the consequence,and they also test

14、ed a slightly different graphene layer called“reduced graphene.”As a result,the number of mostuito bites on naked skin was the highest,about 16 on average;skin only protected by cheesecloth got the second,approximately 10 per five minutesexposure.The exciting finding was that there was no swelling d

15、eveloping on skin covered by the thin graphene layer under cheesecloth,which means the material is effective at preventing mosquito bites.The mosquitoes landed on skin totally uncovered or covered in cheesecloth about 23 times on average,and stayed for one to two minutes.Comparatively,the mosquitoes

16、 landed on skin covered in the graphene layer fewer than 10 times,and the length of their stay was much shorter.Besides,water or sweat can ruin the graphene layer,which allows mosquitoes to bite through it.But fortunately,the number of mosquito bites in either dry or wet conditions can be lowered as

17、 long as the graphene material is improved to certain extent.1 Why did researchers conduct the experiment?A To record the behavior of mosquitoesB To find a substance to prevent mosquito bites.C To find a solution to stop infectious diseases.D To test graphenes effectiveness in preventing mosquito bi

18、tes.2 What was the problem when water and sweat was applied to graphene?A It had no effect on graphene.B It slightly affected graphene.C It improved graphene a little.D It made graphene totally useless.3 In which way did researchers draw a conclusion?A By analyzing the reasons.B By comparing the statistics.C By classifying three situations.D By recording mosquitoess behavior.4 Which of the following shows how the text is developed?A Cause-effect.B Opinion-fact.C Assumption-conclusion.D Phenomenon-evaluation.Thank you!