2020-2021学年课时分层作业13 外研版(2019)选择性必修第二册
新教材2020学年外研版英语必修第二册课时分层作业13 Unit 5 Section Ⅱ Language Points
课时分层作业(十三)[语言知识练习固基础]Ⅰ.单句语法填空1．Do you have to pay to get into the other galleries (gallery) you mentioned?2．Stay longer here.It hasn't quit raining (rain)outside yet.3．You had better get professional (profession)advice before buying stocks.4．Those are words I have not previously (previous)used in any report.5．There was once a rich man living (live) in this big house.6．I draw the line when it comes to lending (lend)money to friends!7．If you think about solutions，goals and dreams，it will try to make them come (come) true.8．Take this opportunity to try (try) something new you have always wanted to try.9．It is said that the operation should have an impact on all of those activities.10．How would you describe your music to those not familiar to you?Ⅱ.完成句子1．我决心做得更好并且为这支车队努力战斗。
I'm determined to do better and fight hard for this team.2．每个人都说那地方值得一看，但我却觉得那儿并没什么特别之处。
2019-2020同步人教英语新课标必修二课时分层作业13 Section Ⅰ Word版含答案
姓名，年级：时间：课时分层作业（十三) Section Ⅰ[高考题型练习提能力］Ⅰ.阅读理解AListening to music is considered a good thing for adults.Indeed it is.Scientific studies have proved it。
Music has so many good effects on our body，mind and mood that this world will certainly not be a good place without music。
Then，is music good for children？ Some parents think so and let their children learn or listen to music.But some parents don't know the importance of music to children。
Here are some reasons why music is important to children.First，music is good for children's intelligence。
Studies have proved that children who learn music are likely to have higher intelligence than those who have no interest in or dislike music。
This is because the brain gets stimulated (刺激) by the rhythm and tone of music。
Music also has soothing （抚慰的) effect on children and helps remove their stress.Today’s children are under a lot of stress from schoolwork。
2020-2021学年外研版(2019)高中英语 必修第二册学案：Unit 4 Stage and
姓名，年级：时间：课时分层作业（十二)Ⅰ.阅读理解AAs a child，Marta was surprisingly creative painting pictures before she received any formal training。
At age 8，she informed me she planned to become a film。
maker and stuck to that until，at 17,she and I decided that instead of taking a course in film,she should be apprenticed to a brilliant sound editor，Bruce Nyznik,and his talented associates such as Peter Tilley，with whom I was then working.Marta’s love of trains led to the creation of her first film，Train of Thought，in 1991。
After that transition from sound to film，she continued to direct and produce,as well as edit.Her works include Shattered Dreams,a 2006 documentary about a disadvantaged youth in Toronto；The Saviour of Ceylon，a film about the heroism of RCAF officer Leonard Birchall；and the sevenpart television series Being 80 with Jean Vanier。
2020-2021学年新教材英语人教版必修第二册课时分层作业13 Unit 5 Word版含解析
姓名，年级：时间：课时分层作业（十三）Ⅰ.单词拼写1．It is rather difficult for them to have another chance to give a performance（表演)in the city hall。
2．Take this opportunity(机会），and I guarantee you won’t regret it.3．The majority of citizens consider an ordinary(普通的）job boring or even valueless。
4．He's much thinner nowadays（现在)than he used to be， I think he’s been ill。
5．This pass always enables（使能够)me to travel half.price on trains.6．She studied hard，thus（因此）she got high marks.7．To save energy（能源)，we’d better recycle these waste bottles.8．In order to prove(证明)her point，she showed them the latest sales figure.9．Altogether（共计）there were 12 scientists present at the international meeting.10．His goalkeeping won him the man of the match award （奖）。
Ⅱ.阅读理解AOn a dark winter day in Russia in 1896，SergeiProkofiev sat by a piano next to his mother。
2020-2021学年课时分层作业16 外研版(2019)选择性必修第二册
课时分层作业(十六)Ⅰ.单词拼写1．We restrict(限制) the number of students per class to 50.2．He stared at the diamonds with greedy(贪婪的) eyes.3．I asked three building firms to estimate for the repairs to the house.4．We saw a man enter the room like a thief in the night.5．In that country most crimes are committed by young men.6．Contrary to some of the reports that you see, crime(犯罪) along the border is down.7．Factories are grouped in the southern suburb(郊区) of the city.8．Next time when we go to the beach we should be careful with our garbage．9．He had administrators under him but made the crucial(关键性的) decisions himself.10．In terms of urban(城市的) architecture, the river plays no role at all.Ⅱ.阅读理解AThe survival of about one fifth of the world's vertebrates — animals with a backbone — is considered threatened, according to new research published in the journal Science.That's a large fraction of Earth's animals, but this new study held some good news too.Conservation efforts by humans have slowed the loss of many species of amphibians (两栖动物), birds, and mammals.Losses in these groups would have been about 20 percent greater had it not been for recent action of protection.Among the animalconservation success stories is one about birds called Mauritius kestrels (红隼)．In the 1970s, just four of these birds were left in the world.Through a special breeding program, scientists were able to increase their number to about 1，000 and release them into the wild.Humpback whales (座头鲸) have benefited greatly from recent conservation efforts as well.They were once on the International Union for Conservation of Nature's (IUCN) list of species threatened with extinction.But the species is now in less danger, thanks to laws that ban whale hunting.The IUCN even movedthe humpback into “species of the least concern”．Over the past 100 years, the white rhino (犀牛) of South Africa has also made an amazing recovery because of habitat protection.The breed multiplied from just 50 animals to about 17，000.Their home has been turned into a protected area, safe from poachers (people who hunt animals illegally) and other threats.Stuart Butchart, one of the authors of the new study in Science, is encouraged by the positive effects of conservation.But he says, “Biodiversity (生物多样化) of species is in a frightening state.Its situation is getting worse.But our results show we can turn the situation around.”New conservation policies hopefully are on the way.One hundred ninetythree countries recently met in Japan at the Convention on Biological Diversity to set goals for preserving threatened wildlife and their habitats.Only 1 percent of ocean and 12 percent of land areas were protected under earlier agreements.Two new goals set by the group are to designate (指定) 10 percent of the world's ocean and 17 percent of land environments as protected areas to help increase endangeredanimal population.【语篇解读】本文是一篇环保类说明文。
2020-2021学年新教材英语外研版必修第二册课时分层作业11 Unit 4 Stage and
姓名，年级：时间：课时分层作业（十一）Ⅰ.单句语法填空1．Being（be） in a hurry，he told me what I had to do briefly.2．He has lost all his friends as a result of his foolish behaviour（behave)．3．Though having been affected(affect）to some extent，our economic situation is encouraging.4．I found my father sitting（sit) in his chair,reading a magazine。
5．The absence（absent） of a quiet place at home where children can study was also having a negative effect。
6．He decided to work as a tour guide because the chance of working abroad appealed to him.7．In order to escape being caught(catch）,the thief attempted to hide himself among the trees but failed。
8．The government plans to bring in new laws forcing parents to take responsibility(responsible) for the education of their children。
9．In order to live up to their parents' expectations，most of the kids have to study hard even over vacations.10．One by one,the applicants left the interviewer's office with disappointed（disappoint） looks on their faces。
2020-2021学年英语外研版(2019)选择性必修第二册课时分层作业14 Unit 5 A d
姓名，年级：时间：课时分层作业（十四)Ⅰ。
单句语法填空1．Some people who are very intelligent and successful in their fields find it difficult to succeed in language learning。
2．I think it necessary for a student to master(master） a foreign language.3．I hate it when people talk with their mouths full.4．We would much appreciate it if you could do us that favour。
5．Don’t take it for granted that they will support you。
6．They haven't made it known(know) where the meeting is to take place.7．Sales decreased to 5。
67 billion francs from 5.69 billion francs。
8．Japanese media reported the sound of an explosion(explode) at one of the plants.9．Owing(owe) to the small size of this breed, they can be conveniently kept in small homes.10．It is on Sunday that we don’t need to go to school.Ⅱ。
完形填空One month ago， Sarah bought a lipstick（口红) she had desired.It's not 1 ， but it made her happy, because it was the one that she had been 2 since she saw it.Every morning， when she puts on her makeup， everything seems brand new due to this lipstick。
2020-2021学年统编版高中语文选择性必修下册 13《自然选择的证明》课时作业
13 自然选择的证明一、基础知识1.下列各组词语的字形,有错误的一项是( )A.驯养竞争博物学择优弃劣B.尊循亲缘蹼状脚错综复杂C.障碍繁殖贫齿类不胜枚举D.横渡歧异世系链大惊小怪2.依次填入下面横线处的虚词,最恰当的一项是( )动植物确有变异, 这一变异是多么微小和缓慢, 其变异或个体差异在某一方面有益于自身发展,它们为什么不会通过自然选择将其保存和积聚起来, 所谓最适者生存呢? 人们能够耐心地选择有利于自己的变异, 在复杂而多变的生活条件下,那些有利于自然界生物的变异为什么不会经常产生,并得到保存或选择呢?A.如果不管只要即如果那么B.如果虽然只有如如果那么C.既然不管只有即因为所以D.既然虽然只要如因为所以3.下列各句标点符号使用有误的一项是( )A.那些在漫长的时间长河里起作用的,并严格审视每一个生物的全部体制、构造和生活习性的选择力量——即择优弃劣的力量,会受到什么限制呢?B.这使大类群在规模上不断扩大,性状分异更趋明显,并不可避免地导致大量物种的绝灭;这就可以解释为什么仅有极少数大纲在竞争中自始至终占据着优势,而其中所有的生物类型都可以排列成许多大小不一的次一级生物群。
C.由于自然选择仅通过对微小的连续且有益变异的逐步积累而产生作用,因而它不会导致巨大的突变,而只能按照缓慢而短小的步骤进行。
所以,已为新知识所不断证实的“自然界中没有飞跃”这一格言也是符合自然选择学说的。
D.下述现象似乎十分奇怪:一种像啄木鸟形态的鸟却在地面上捕食昆虫,高地上的鹅很少或根本不游泳,但却具有蹼状脚;一种像鸫的鸟却能潜水并取食水生昆虫;一种海燕却具有适合海雀生活的习性和构造。
4.下列各句没有语病的一项是( )A.通过地质学清楚地揭示,各个大陆过去都曾经历过巨大的环境条件变迁。
所以我们可望在自然条件下看到生物的变异,如同它们在驯养情况下所发生的那样。
B.由于生物在漫长的演化和变异历程中,通常其性状都随之发生了分异,所以我们便能理解为什么那些比较古老的类型或每一生物群的早期祖先类型,在分类谱系上常或多或少地处于各现生类群之间。
【同步专练】2020-2021学年课时分层作业4 外研版(2019)选择性必修第二册
课时分层作业(四)Ⅰ.单词拼写1．We all know how important security(安全) is to your environment.2．As babies，we rely(依赖) entirely on others for food.3．Many divorced fathers only have access to their children at weekends.4．Heat the sauce，stirring constantly．5．We first build up a detailed profile(概况) of our customers and their requirements.6．I had other matters to occupy me，during the day at least.7．The plan is designed to motivate(激励) employees to work more efficiently.8．Do you think she'll notice if I switch(转换) my glass with hers?Ⅱ.阅读理解AFrom a very early age，some children exhibit better selfcontrol than others.Now，a new study that began with about 1，000 children in New Zealand has tracked how a child's low selfcontrol can predict poor health，money troubles and even a criminal record in their adult years.Researchers have been studying this group of children for decades now.They observed the level of selfcontrol the youngsters displayed.Parents，teachers，even the kids themselves，scored the youngsters on measures like“acting before thinking”and“Persist ence in reaching goals.”The study led by Moffitt of Duke University and colleagues followed 1，000 children from birth to age 32 in Dunedin，New Zealand.“The children who had the lowest selfcontrol when they were age three to ten，later on had the most health problems in their 30s，”Moffitt said，“and they had the worst financial situation.They were more likely to have a criminal record and to be raising a child as a single parent on a very low income.”Moffitt explained that selfcontrol problems were widely observed，and weren't just a feature of a small group of misbehaving kids.Moffitt said it's still unclear why some children have better selfcontrolthan others，though she said other researchers have found that it's mostly a learned behavior，with relatively little genetic influence.But good selfcontrol can be set to run in families because children with good selfcontrol are more likely to grow up to be healthy and prosperous parents.But the good news，Moffitt said，is that selfcontrol can be taught by parents，and through school curricula that have been shown to be effective.【语篇解读】文章主要讲述了自制力弱的孩子可能会健康状况不佳，资金困难，甚至在成年后会有犯罪倾向。
【同步专练】2020-2021学年课时分层作业7 外研版(2019)选择性必修第二册
课时分层作业(七)Ⅰ.单词拼写1．The plan of reconstruction(重建) has not taken on the shape yet.2．Young children will usually compete(竞争) for their mother's attention.3．A decade is a period of ten years.4．We need to buy some new furniture．5．I was very dusty and dirty and went up to my room to wash.6．Our heartfelt sympathy(同情) goes out to the victims of the war.7．We now need a new leader of the party and a new style of leadership．8．The film's about an elderly(年老的) woman and a young nurse who befriends her.9．He had left a huge bunch of flowers in her hotel room.10．The mist(薄雾) melted rapidly in the morning sun.Ⅱ.阅读理解AElectronic books have changed the way manypeople read for pleasure.Now online textbooks arechanging the way some students learn and someteachers teach.More than one hundred seventyfivethousand students attend the public schools in Fairfax County, Virginia, outside st year, the school system used digital books in fifteen schools.This school year, middle schools and high schools changed from printed to electronic textbooks in their social studies classes.Luke Rosa is a history teacher at Falls Church High School.His students work on laptop computers at school.He explains the idea to them this way，“I mean, it's just like a regular textbook, except it's got it all, online.”Peter Noonan, an assistant superintendent (助理监督) of schools, said，“The world's changing.And the online textbooks can change right along with the events that are happening.” Digit al books also cost less than printed textbooks, he said.A student named Melanie Reuter said, “I don't have to carry a textbookaround, so that's nice.”But another student said，“I don't like it because the Internet sometimes doesn't work.”Students also need access to the Internet when they are not at school.About ten percent of students in Fairfax County do not have a computer or online access at home.Public libraries in the county have free Internet.There are also afterschool computer labs as well as computer clubhouses supported by the county.Middle school student Slieman Hakim is happy about that.He said, “My family only has one computer；my sister and I both do our homework on it.So I come here to do my homework.It's good.”Other school systems in the area are also considering online textbooks.【语篇解读】随着因特网的普及，电子教材正在改变着学生学习和老师授课的传统模式。
【同步专练】2020-2021学年课时分层作业12 外研版(2019)选择性必修第二册
课时分层作业(十二)Ⅰ.阅读理解AAs globalization continues to make the world a smaller place, and goods become more accessible across borders，concerns about food safety in the Asia Pacific region have steadily risen over the years.An APEC forum is being held in Beijing，to find ways to better address the problem.156 participants from 19 APEC economies and 4 nonAPEC members attended the APEC Food Safety Cooperation Forum，which has been actively looking for ways to strengthen food safety standard in the region，without affecting trade.“As consumers are faced with more varieties of food，the potential food safety risk also becomes bigger.This forum has helped APEC economies to cooperate in supervision (监督)，exchange information，and improve the overall food safety standard in the AsiaPacific region，” said director of China's General Administration of Quality Supervision Wu Qinghai.For the first time the forum has brought together highlevel regulators，academics，and industry stakeholders to talk about their respective roles in safety supervision.They say governments alone cannot shoulder this heavy duty.In China，the continuous food safety problems have greatly hurt consumers' confidence in domestic products；therefore more turned to imports. However，problems related to quality of those imported goods also began to show.In July this year，more than 400 batches (批) of food imported from 35 countries and regions were found substandard by the country's top quality supervisor.Governments and industries have been brought closer by this forum.As food moves more freely beyond borders，this forum is hoped to promote safety control cooperation，so APEC members can better benefit from the economic integration(经济一体化)．【语篇解读】通过APEC论坛，各国之间将更加密切地合作，食品安全问题将得到更有效的监管和处理，各成员国都会从中受益。
2020-2021学年课时分层作业11 外研版(2019)选择性必修第二册
课时分层作业(十一)Ⅰ.单句语法填空1．It is unlucky(lucky) that their group will get ahead of us.2．It is said that nothing has been done about it.3．It was clear enough what she meant.4．It hasn't been made clear when the new road is to be opened to traffic.5．Everybody spoke in praise of her devotion(devote) to the cause of education.6．My grandfather assisted me in making(make) the right choice.7．Do you think that was the first time my vital energy has gone(go) out of me?8．It is vital that enough money should be collected(collect) for the project.9．It's his job to help(help) people lead better lives.10．Finally, I convinced a vet, who specialized in laboratory animals, to take the lump out.Ⅱ.完形填空Love Is Blind: The Magic of TabbyIn October, 2003, I started my work at my local animal shelter's Adoption Department.Over the years, more than 50，000 animals have 1 the doors of the shelter.Most of them, I do not remember.But occasionally there are special animals, who touch me so deeply that I could never possibly 2 them.Tabby was one such animal.Tabby was an ancient Cocker Spaniel, probably 14 years old.What's more, she was blind and deaf.Tabby's chances at adoption seemed 3 at best.After all, we didn't have many adopters coming in asking, “Can you show me all of your really old dogs who are also 4 ？”We had all thought that Tabby would live out the rest of her life at the 5 ．One day a woman named Loretta came to the shelter.Her son, Gary, had 6 Tabby's picture and stories on the shelter's website at home.They were interested in meeting her! It was the only enquiry we ever received aboutTabby.What could a young child possibly see in a 14yearold dog who was both blind and deaf? Most boys would want a dog who could grow with them and 7 through grassy fields on summer days.Tabby would 8 be able to do that.But after meeting her, Loretta and Gary decided that she was the right dog for their family.They adopted Tabby!If Tabby's story had simply ended with her 9 adoption, it would still have been something very special indeed. 10 ， it was what happened after her adoption that people might regard as “magic”．Gary suffered from seizures(癫痫)．Since Gary and Tabby met they became 11 . They did everything together.They became so “in tune” with one another that Tabby began to telegraph Gary's seizures before they occurred, giving his family a(n) 12 that one was about to strike.What's more, Gary seemed to be having fewer and fewer seizures since Tabby's 13 ．How could it be? Nobody could explain 14 Tabby did it.But those of us who were fortunate enough to know her and her family had 15 the magic, the kind that has its roots in love.【语篇解读】这是一篇记叙文。
2020-2021学年新教材英语外研版必修第二册课时分层作业13 Unit 5 On the ro
姓名，年级：时间：课时分层作业（十三)Ⅰ.单词拼写1．The joy of travelling is not in arriving at your destination （目的地） but in the journey itself.2．Acting is definitely a young person’s profession（行业）in many ways.3．Some of his paintings are on show in the local art gallery(美术馆）．4．A kangaroo（袋鼠），which moves by jumping,is a large Australian animal with a strong tail and back legs。
5．Before you quit(离开） your job,consider how your family would feel about your decision.6．Our city has developed into a big one，which is four times as big as the previous(先前的） one。
Ⅱ.阅读理解A3 Days Dunhuang Bike TourGoing on a bike is a great way to explore the natural beauty of Dunhuang。
Our tour is spent riding along the country road and the edge of town where we'll pass by country houses，farmlands and vineyards（葡萄园）to show you the beauty of the little oasis （绿洲）in the desert。
Unit1-Unit2--2020-2021学年高二英语外研版(2019)选择性必修第二册
外研版选择性必修第二册unit1+unit2课文语法填空+课文原句翻译unit1Ⅰ.After reading the passage，please fill in the following blanks.Three young people who come from different countries tell us what turning 18 1.________(mean) to them.Bethany thinks it’s not 2._____(fair) that she can’t vote and take her 3._______(drive) test because she is not old enough to have these rights.Lin Ning holds the idea 4.______ he can do things 5.______ getting a credit card.More 6.________(important)，he can act on his desire to help others.Although a lot of doors have opened for him，he currently doesn’t have 7.____ steady income.Besides，Morgan 8._________(not，agree)with the view of the majority—18 means becoming 9._______(independence)．His salary is not high enough so he finds it hard to save money.In his opinion，some responsibilities are 10.________(many) about attitude than age.1.means2. unfair3.driving4.that5. like6. importantly7. a8.doesn’t agree9.independent 10. moreⅡ.请快速背写下列课文原句1．当然，如果你到了挣工资纳税的年龄，你应该被允许对政府如何使用它们有发言权。
2020-2021学年英语人教版(2019)选择性必修第二册课时分层作业7 Unit 3 Food
姓名，年级：时间：课时分层作业(七）Ⅰ.单词拼写根据汉语提示写出单词。
1．The hotel has a large dining room serving superb local cuisines(菜肴）．2．He received a set of china consisting(组成) of sixty pieces。
3．If you want the dish to turn out right you should follow the recipe(食谱)．4．She flavored the fish with sugar and vinegar（醋)．5．There is too much onion (洋葱） in the salad。
6．She produces elegant （高雅的） wedding gowns in a variety of sumptuous fabrics。
7．Many of Britain’s beaches fail to meet minimum （最低的） standards of cleanliness。
8．A crop of tomatoes enriches the soil and makes it suitable for growing cabbages （甘蓝）．9．This nut pudding is a rich dessert （甜点) with a special flavour.10．In the cafeteria （自助餐厅) we serve ourselves.Ⅱ。
阅读理解ALiving a healthy lifestyle lies in forming the right eating habits。
Here are some of the good habits you can develop whenit comes to healthy eating.Drink plenty of water.You must drink at least 8 glasses of water a day。
2020-2021学年英语外研版(2019)选择性必修第二册课时分层作业15 Unit 5 A d
姓名，年级：时间：课时分层作业（十五)Ⅰ。
阅读理解AWith only about 1， 000 pandas left in the world, China is desperately trying to clone(克隆) the animal and save the endangered species(物种）．That's similar to what Texas A&M University researchers have been undertaking（负责） for the past five years in a project called “Noah’s Ark”．Noah’s Ark is aimed at collecting eggs， embryos(胚胎), semen and DNA of endangered animals and storing them in liquid nitrogen （氮）．If certain species should become extinct, Dr。
Duane Kraemer, a professor in Texas A＆M’S College of Veterinary Medicine，says there would be enough of the basic building blocks to reintroduce the species in the future。
It is estimated that as many as 2， 000 species of mammals，birds and reptiles will become extinct in over 100 years。
The panda， native only to China， is in danger of becoming extinct in the next 25 years.Chinese scientists said they grew an embryo introducing cells from a dead female panda into the egg cells of a Japanese white rabbit.They are now trying to implant the embryo into a host animal.The entire procedure（过程） could take from three to five years to complete。
2020-2021学年英语外研版(2019)选择性必修第二册模块整合训练1 Word版含解析
姓名，年级：时间：模块整合训练(一)Ⅰ.阅读理解（共15小题；每小题2.5分,满分37。
5分)AWhen Alfred Nobel created the prizes that bear his name，he decided that they be given for work done in the previous year。
But it has led to all kinds of trouble—as it did once again this month，when the Nobel Prize in Medicine or Physiology was awarded to a dead man.It is a complex story，one that could not have been foreseen when Nobel，the Swedish inventor，died in 1896。
But it all traces back to his will,written at a time when international prizes were an original idea。
Nobel did not say why he wanted to reward scientists who “made the most important discovery” during the previous year。
One can guess that he wanted to reward presentday innovation and not to give tombstone awards to Galileo，Hippocrates，and other scientists from centuries past。
But will and science often got involved。
2020-2021学年新教材英语外研版选择性必修第二册课时作业(十一) Unit 4 Breaki
姓名，年级：时间：课时作业（十一）Unit 4Section ⅡUsing languageⅠ。
阅读理解AReading books and looking at pictures are great, but nothing facilitates（促进) learning like travel, especially for teenagers。
Not only do they get to see a world beyond their neighborhood, but they get to experience it， feel it, taste it， hear it and better understand the world around them。
After nearly four decades in the classroom and traveling the world， Phyllis Duvall Bailey knew this perhaps better than anyone else.Becoming engaged in the work in AKA Sorority Inc. in the US, she worked to educate children on the United Nations。
There was no doubt in Bailey's mind that the lessons would mean so much more if the students could see these things for themselves。
Starting in 2015， Bailey, 82, set out to take her students to the UN headquarters in New York City to give them a “Window Seat to the World"，and thus transformed them into global citizens.Indeed, it is a great opportunity to give students national and international exposure。
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 Breakin
姓名，年级：时间：课时作业（十) Unit 4Section ⅠStarting out & Understanding ideasⅠ。
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，green, oolong and pekoe tea. This chemical is an amino acid(氨基酸） called L.theanine. 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 cells with antigens （抗原) found in the amino acid. Antigens help the body react to infection。
Then the scientists added some bacteria. Within twenty.four 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 interferon。
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课时分层作业(十三)Ⅰ.单词拼写1．As we all know，rabbits multiply rapidly.2．Do not blame your food because you have no appetite．3．Her mother moved to Shijiazhuang subsequently(随后)．4．How much do I owe you for the groceries?5．How do you evaluate the impact of this incident(事件)?6．The governor called for an inquiry into the motorway's collapse(倒塌)．7．The second half of the game was dull by comparison(比较) with the first.8．They had received no news of him since his departure from the island.9．He had fallen into a trap set by one of the hunters.10．Heavy snow has caused total chaos(混乱) on the roads.Ⅱ.阅读理解AI don't think I can recall a time when I wasn't aware of the beauty of the ocean.Growing up in Australia, I had the good fortune of having the sea at my side.The first time I went to Halfmoon Bay. I suddenly had the feeling of not being able to feel the ground with my feet anymore.For my 10th birthday, my sister and I were taken out to the Great Barrier Reef.There were fish in different colors, caves and layers of coral.They made such an impression on me.When I learned that only 1 percent of Australia's Coral Sea was protected, I was shocked.Australian marine (海洋的) life is particularly important because the reefs have more marine species than any other country on earth.But sadly, only 45% of the world's reefs are considered healthy.This statistic is depressing, so it's important for us to do everything to protect them.The hope that the Coral Sea remains a complete ecosystem has led me to take action.I've become involved with the Protect Our Coral Sea activity, which aims to create the largest marine park in the world.It would serve as a place where the ocean's species will all have a safe place forever.Together, Angus and I created a little video and we hope it will inspirepeople to be a part of the movement.Angus also shares many beautiful childhood memories of the ocean as a young boy, who grew up sailing, admiring the beauty of the ocean, and trying to find the secrets of ocean species.【语篇解读】本文是一篇记叙文。
文章向我们介绍了澳大利亚的海洋生物面临的危机以及作者为此所做的一些努力。
1．From the underlined sentence in Para.1, we can learn the author ________．A．seldom went surfing at the seaB．forgot his experiences about the oceanC．never went back to his hometownD．had a wonderful impression of Halfmoon BayD[句意猜测题。
根据第一段中的“I don't think I can recall a time when I wasn't aware of the beauty of the ocean.”和“I had the good fortune of having the sea at my side.”可知，作者认为大海很美，自己很幸运能经常看到海，故画线句应是对半月湾的赞美。
D项符合文意。
故选D。
]2．According to the second paragraph, Australian marine life ________．A．is escaping from the Coral Sea graduallyB．depends on reefs for living greatlyC．may be faced with dangerD．is protected better than that in other oceansC[推理判断题。
根据第二段“When I learned that only 1 percent of ...are considered healthy.”可推知，澳大利亚的海洋生命可能面临危险。
故选C。
] 3．The Protect Our Coral Sea activity is intended to ________．A．contribute to a complete ecosystemB．prevent more marine species from being endangeredC．set up a large nature reserve for reefsD．raise more teenagers' environmental awarenessB[推理判断题。
根据第三段“I've become involved... a safe place forever.”可推知，这项活动的目的是创造一个为海洋生物提供永久安全的地方，阻止更多的海洋物种灭绝。
故选B。
]4．Angus and the author created a little video to ________．A．urge more people to take action to protect the marine speciesB．inspire more people to explore the secret of the oceanC．share their childhood experiences about the oceanD．bring back to people their memory of ocean speciesA[细节理解题。
根据第四段“Together, Angus and I created a little video and we hope it will inspire people to be a part of the movement.”可知，拍摄视频是为了激励人们去采取行动保护海洋生物。
故选A。
]BA British friend told me he couldn't understand why Chinese people love eating sunflower seeds(嗑瓜子) as a snack so much.“I've met a lot of older Chinese and many have a crack in their front teeth；I believe that's from cracking the seeds，” he said.I had never noticed the habit, but once he mentioned it, I suddenly became more aware.I realized that whenever I'm watching TV or typing a report, I always start mindlessly cracking sunflower seeds.My friend doesn't like sunflower seeds, and, to him, it seems unnecessary to work so much just to get one small seed.When we were young, the whole family would usually get together for Chinese New Year.Then, we all lived close to one another, usually in a small city, and sometimes even neighbors would go doortodoor on Chinese New Year's Eve to check out what every household was making.I remember my parents would be in the kitchen cooking.Out in the living room, a large table would already be laid out, complete with fancy tablecloth, readymade dumpling fillings, and dishes full of candy, fruits and sunflower seeds.Some of the dishes were to be offered to our ancestors later, while others were for neighbors and children to eat before the evening feast.I must have learned how to crack sunflower seeds back then.I don't think it's right to criticize one's choice in food or eating habits, no matter how strange they may seem.It's not only in China.When I went abroad, I found people had all sorts of strange habits when it came to food.In Denmark, they put salted red fish on bread and eat it for dinner, no matter how much it ruins your breath.Theythink it's a delicacy(美味佳肴), and it's connected to their certain culture.I think it's a wonderful tradition.【语篇解读】本文用中国人喜欢嗑瓜子和丹麦人喜欢吃面包配咸红鱼来证明饮食习惯来自特定的文化。