2020-2021学年新教材英语外研版选择性必修第二册课时作业（十） Unit 4　Breaking boundaries Section Ⅰ　Starting out Understanding ideas Word版含解析

1、课时作业(十)unit 4section starting out & understanding ideas.阅读理解aamerican researchers say drinking tea may help strengthen the body's defense system against infection. doctors at brigham and women's hospital in boston, massachusetts, did the study. the team studied a chemical found in black,

2、 green, oolong and pekoe tea. this chemical is an amino acid(氨基酸) called l­theanine. the scientists say it may increase the strength of gamma delta t cells. that's the letter t, not the drink. gamma delta t cells are part of the body's defense. first, the researchers mixed some of these

3、 cells with antigens (抗原) found in the amino acid. antigens help the body react to infection. then the scientists added some bacteria. within twenty­four hours, the cells produced a lot of interferon (干扰素), a substance that fights infection. cells not mixed with the antigens did not produce int

4、erferon.in the second part of the study, eleven people drank five to six cups of black tea every day. ten other people drank the same amount of instant coffee. that is dried coffee mixed with hot water. two weeks later, and again two weeks after that, the researchers tested the blood of all twenty&#

5、173;one people. they also looked at what happened when they added bacteria to the blood cells. they found that the tea drinkers produced five times more interferon after they started drinking tea. the coffee drinkers did not produce interferon. doctor jack bukowski led the study. he said the antigen

6、s added to the gamma delta t cells were responsible for the increased reaction to the bacteria. he said that the study also showed that the cells were able to remember the bacteria and fight them again next time. earlier research has already found that tea can help prevent heart disease and cancer.

7、doctor bukowski says the new study must be repeated by more people. “if the findings prove to be true，” he says, “then tea drinking might also help protect against bacterial infection.” he says the amino acid l­theanine could be removed from the tea and used as a drug to strengthen the body'

8、;s defense.1we may know from the text that _ can be found in different kinds of tea. al­theanine bgamma delta t cells cinterferon dbacteria2tea may help strengthen the body's defense system because it helps _. ato add some bacteria to the blood cells bthe body to produce more gamma delta t

9、cells cthe body to produce more interferon dto mix antigens with some of the cells in the body3according to dr bukowski, _. athe findings of the study have already proved to be true bfurther study is needed to prove the findings true che has taken some amino acid l­theanine from tea and made a

10、drug with it dhe is not sure whether tea can help prevent heart disease and cancerb doctors without borders, which was set up in 1971 by doctors and journalists in france, is a humanitarian (慈善的) organization also known as its french name, médecins sans frontières, and handles emergencies

11、caused by wars, infectious diseases and natural disasters. today, the group provides humanitarian medical aid in more than 70 countries. over 90 percent of its money comes from private sources. in 1999, the group received the nobel peace prize. living in emergency: stories of doctors without borders

12、 is a documentary by the movie director mark hopkins. it tells the stories of four doctors and their voluntary work in liberia and the democratic republic of congo. mr. hopkins and his crew filmed the doctors working under some of the most extreme and dangerous conditions. doctor tom krueger from th

13、e united states in the film volunteered in liberia in 2003, after two civil wars. he said, “it was pretty much of a shock when i got here. you can't describe the feeling of the heat in your body and the sweat running down your back, and the smell of the pus (脓) that hits your nose and of unwashe

14、d bodies in a closed room.” another doctor in the film, australian chris brasheer, has been with doctors without borders for nine years. he has served in the democratic republic of congo and spent time in liberia. he said, “ no water, no electricity, no foodpretty apocalyptic really. ” doctor chiara

15、 lepora from italy also appears in the film. she spent several years working with the group. she said, “i will probably return. there are a lot of doctors who are willing to volunteer once, but not many doctors who are willing to repeat their experience. ”4what can we know about doctors without bord

16、ers?ait finds peaceful solutions to world problems.bit provides free medical aid for the countries in trouble.cmost of its money comes from the government.dit was started only by doctors in the early 1970s.5which of the following is true about living in emergency: stories of doctors without borders?

17、ait is a documentary about mr. hopkins' crew.bit tells the stories of 4 doctors from the same country.cit is about how doctors without borders was set up.dit was filmed in countries full of starvation and thirst.6what does the underlined word “apocalyptic” in the fourth paragraph probably mean?a

18、like the dangerous conditions. blike the end of the world. clike the smell of dead bodies. dlike the feeling of sadness.七选五standing strong for wuhan in the battle against covid­19, medical workers fight in the front line, while people from all walks of life help pass on love to one another. _1_

19、an infected man goes viral (走红)a man infected with the novel coronavirus became an internet celebrity (名人) after a video of him went viral. _2_ a medical staff member passes by with a thumbs­up. the 39­year­old man, surnamed fu, is a post­doctor teaching at florida state universi

20、ty in the united states. he came to wuhan to visit his parents, who were also infected with the novel coronavirus.with love from el salvador_3_ on feb. 7, 11­year­old javier castellano and his 13­year­old sister valeria painted a picture to send their blessing as china fights to

21、contain the deadly coronavirus. _4_ valeria said that she heard about the epidemic on the news and she believed that china would overcome this huge challenge.up and runningon feb. 4, medical workers transferred patients to the newly­built huoshenshan hospital in wuhan. _5_ the city government i

22、nvestigated (调查) coronavirus­infected citizens in local communities and transferred critical cases to the hospital. “the diagnosis (诊断) of patients is speeding up，” xiong wei, deputy director of dewang community neighborhood committee, told xinmin evening news.ael salvador is a heavily populate

23、d country in north america.bchina is receiving support from around the world, including el salvador.ctake a look at the following touching moments!dthis special emergency­response hospital was built in 10 days and has a capacity (容量) of 1,000 beds.ein the video, he can be seen reading francis f

24、ukuyama's the origins of political order at jianghan cabin hospital.fthe video showed what the life was like in the new hospital with some patients dancing and some others reading or shooting pictures.gtheir painting says, “come on, china! el salvador loves china.”课时作业(十).阅读理解a【语篇解读】这是一篇说明文。文章主要

25、讲的是喝茶可以增强身体对感染的抵御能力，因为茶可以使身体制造出更多的干扰素。1答案与解析：a细节理解题。根据第一段中的the team studied a chemical found in black, green, oolong and pekoe tea. this chemical is an amino acid(氨基酸)called l­theanine.可知，不同的茶里面都有的物质是l­theanine，故选a。2答案与解析：c细节理解题。根据第二段中的“within twenty­four hours，the cells produced a lo

26、t of interferon(干扰素), a substance that fights infection.”可知茶有助于加强身体的免疫系统是因为它可以使身体制造出更多的干扰素，故选c。3答案与解析：b细节理解题。根据最后一段中的doctor bukowski says the new study must be repeated by more people.可知doctor bukowski认为要证明这个发现是对的，还需要更多的研究，故选b。b【语篇解读】本文介绍了无国界医生组织，以及相关纪录片living in emergency: stories of doctors without borders所描述的医生在利比里亚和刚果民主共和国恶劣环境中的救援经历。4答案与解析：b考查细节理解。根据第一段中的“doctors without borders，which was set up in 1971 by