Can eating a chocolate bar every day really prevent age-related memory loss? No. But a new research shows that large amounts of flavones(黃酮), substances found in cocoa, tea and some kinds of vegetables, may improve age-related memory failure.

Dr. Scott Small is a professor of neurology (神經(jīng)學(xué)) at Columbia University in New York City. He is the lead writer of a research paper describing the effects of cocoa flavones on brain activity. His study involved 37 volunteers aged between 50 and 69. Researchers gave them a high-level flavones drink made from cocoa beans or a low-level flavones drink. For a period of three months, some subjects got 900 milligrams of flavones a day. The others got 10 milligrams of flavones each day. Brain imaging and memory tests were given to each study subject before and after the study. Dr. Small says that the subjects who had the high-level flavones drink showed much improvement on memory tests.

The researchers warn that more work is needed to be done because this study was performed only on a small group. Dr. Joann Manson is the lead researcher of a four-year study involving 18,000 adults. This study will use flavones capsules. The study subjects will be divided into two groups and will take two pills per day. The capsules used will all look the same. But one group's capsules will contain flavones, while the other group will take capsules made of an inactive substance, or placebo（安慰劑）.

Dr. Manson says it's not necessary for people to start eating more chocolate, because 3 persons would have to eat a huge amount of chocolate to get the same level of flavones given to the rest subjects. He adds many manufacturers have planned to remove the flavones from their chocolate products. Similarly, Dr. Manson says a cocoa-based flavones extract（提�。﹎ay be developed in the future But he says that more studies are needed to see how much flavones is good for our health.

1.What was done to the subjects after Dr. Small's study?

A. They were asked to take a high-level flavones drink.

B. They were given brain imaging and memory tests.

C. They were given capsules containing flavones.

D. They were asked to take two pills of flavones capsules per day.

2.What's the similarity of the two experiments?

A. Both use high-level flavones capsules.

B. The number of the subjects is the same.

C. Drinks and placebos are used in both experiments.

D. The subjects are divided into two groups in both experiments.

3.Why will Dr. Manson carry out the four-year study?

A. To carry out the experiment further.

B. To prove the first experiment is wrong.

C. To test how much flavones can improve our memory.

D. To show eating chocolate is better to improve memory.

4.What can we learn from the last paragraph?

A. It's not necessary for us to eat chocolate.

B. In the future we can get flavones without eating chocolate.

C. The more we eat flavones, the better our health will be.

D. It's easy for people to get the same level of flavones given to the test subjects.

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：2016屆福建漳州八校高三12月聯(lián)考英語試卷（解析版） 題型：閱讀理解

A typical lion tamer（馴獸師）in people’s mind is an entertainer holding a whip( 鞭) at a chair. The whip gets all of the attention, but it’s mostly for show. In reality, it’s the chair that does the important work. When a lion tamer holds a chair in front of the lion’s face, the lion tries to focus on all four legs of the chair at the same time. With its focus divided, the lion becomes confused and is unsure about what to do next. When faced with so many options, the lion chooses to freeze and wait instead of attacking the man holding the chair.

How often do you find yourself in the same position as the lion? How often do you have something you want to achieve (e.g. lose weight, start a business, travel more)—only to end up confused by all of the options in front of you and never make progress?

This upsets me to no end because while all the experts are busy debating about which option is best, the people who want to improve their lives are left confused by all of the conflicting information. The end result is that we feel like we can’t focus or that we’re focused on the wrong things, and so we take less action, make less progress, and stay the same when we could be improving.

It doesn’t have to be that way. Anytime you find the world waving a chair in your face, remember this: All you need to do is focus on one thing. You just need to get started. Starting before you feel ready is one of the habits of successful people. If you have somewhere you want to go, something you want to accomplish, someone you want to become…take immediate action. If you’re clear about where you want to go, the rest of the world will either help you get there or get out of the way.

1.Why does the lion tamer use a chair?

A. To entertain the audience.

B. To show off his skills.

C. To get ready for a fight.

D. To trick the lion.

2.In what sense are people similar to a lion facing a chair?

A. They feel puzzled over choices.

B. They hold on to the wrong things.

C. They find it hard to make changes.

D. They have to do something for show

3.What is the author’s attitude towards the expert mentioned in Paragraph3?

A. Tolerant. B. Doubtful.

C. Respectful. D. Supportive.

4.When the world is “waving a chair in your face”, you’re advised to _____

A. wait for a better chance

B. break your old habits

C. make a quick decision

D. ask for clear guidance

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年河南許昌四校高二上學(xué)期第三次聯(lián)考英語試卷（解析版） 題型：完形填空

完形填空,閱讀下面短文，從短文后各題所給的四個(gè)選項(xiàng)（A、B、C和D）中，選出可以填入空白處的最佳選項(xiàng)，并在答題卡上將該項(xiàng)涂黑。

My daughter and I finally got around to changing all the electronic pictures stored on our computers and cellphones into ________ ones that we could actually hold in our hands and________ photo albums. It was amazing looking through decades of our lives.

There I was not even 5 years old. I looked at that boy and all those ________ versions of myself for a long time. I wondered what I would say to them ________ I had a chance. I knew that I would tell them to relax and not worry about life’s ________ so much. I would tell them that they would solve all the problems they could and ________ the ones they couldn’t. I would tell them to enjoy and ________ each day as it comes. I would tell them that every day has its own ________ and simple pleasures and they should ________them all. I would tell them to hug more, laugh more, and say “I love you” more. I would ________ them to take in more sunsets and to________ the television every so often and go watch the stars. I would tell them to sing along with the radio and read a good book every ________ they get. I would tell them to ________ pass up the opportunity to pet a dog or ________ another human being. Most of all, ________ ,I would tell them to just love, ________ that’s what we are here to do.

________ , I know that none of us can go backward in this life. Life can only go ________ . As you go forward in your own life, always take with you the wisdom you have ________, the kindness you have shared, and the ________ you have received. As you go forward, always try to be the best person you can be and always remember to just love and be loved in return.

1.A.colored B. expected C. printed D. idealized

2.A.take from B. put into C. cut off D. pick out

3.A. younger B. weaker C. happier D. newer

4.A.since B. unless C. as D. if

5.A. influences B. troubles C. changes D. failures

6.A. get through B. face with C. figure out D. run into

7.A. waste B. call C. win D. value

8.A.expectations B. ways C. delights D. plans

9.A. receive B. appreciate C. find D. provide

10.A. warn B. allow C. advise D. promise

11.A. switch on B. turn up C. discuss about D. turn off

12.A. chance B. reason C. success D. moment

13.A. always B. Sometimes C. never D. ever

14.A.welcome B. ask C. believe D. help

15.A. therefore B. though C. otherwise D. instead

16.A. because B. even if C. while D. as if

17.A. For example B. In conclusion C. Of course D. After all

18.A. well B. forward C. quickly D. smoothly

19.A. gained B. proved C. accepted D. doubted

20.A. attention B. prizes C. honors D. love

查看答案和解析>>

科目：高中英語 來源：2016屆山東棗莊第三中學(xué)高三12月質(zhì)量檢測英語試卷（解析版） 題型：語法填空

語法填空：閱讀下面材料，在空白處填入適當(dāng)?shù)膬?nèi)容（1個(gè)單詞）或括號內(nèi)單詞的正確形式。

When my brother and I said we were going to spend our Christmas holidays abroad, the whole family objected violently. But nothing could persuade us1.(stay). Two days2. Christmas, we went to a small town in Southern Germany. We 3. (spend) the whole of Christmas Eve sightseeing.

There were 4. many activities in the town that they added to our excitement. The streets were crowded with people 5.the shops were full of wonderful things. In the evening. We went to listen to Christmas songs 6.(sing)by children around the 7. (bright) decorated Christmas tree in the main street. We planned to have 8. meal at the best restaurant in town the next day. However, in the morning the streets were empty. What’s worse, all the shops including the restaurants were shut. As last we had to return to our hotel, 9.(feel) very miserable. Our Christmas “feast” was a bag of fruits, 10.my brother had happened to buy the day before.

查看答案和解析>>

科目：高中英語 來源：2016屆寧夏回族自治區(qū)銀川一中高三上第五次月考英語試卷（解析版） 題型：書面表達(dá)

假如你是李華，你的筆友Mike從電視上得知前段時(shí)間北京多個(gè)地方出現(xiàn)霧霾（haze），非常擔(dān)心，寫E-mail詢問有關(guān)情況，請回復(fù)�；貜�(fù)應(yīng)包括以下要點(diǎn)：

1.實(shí)況描述；

2.對生活造成的影響；

3.成因簡析與教訓(xùn)；

4.你個(gè)人的情況。

要求：1．詞數(shù)100-120；

2．email的開頭與結(jié)尾已給出，不計(jì)入總詞數(shù)。

Dear Mike，

Thank you very much for your concern.________________________________________

______________________________________________________________________________

______________________________________________________________________________

Regards!

Yours ,

Li Hua

查看答案和解析>>

科目：高中英語 來源：2016屆河北正定中學(xué)高三上學(xué)期第五次月考英語試卷（解析版） 題型：短文改錯(cuò)

假定英語課上老師要求同桌之間交換修改作文, 請你修改你同桌寫的以下作文。文中共有10處語言錯(cuò)誤, 每句中最多有兩處。每處錯(cuò)誤僅涉及一個(gè)單詞的增加、刪除或修改。

增加：在缺詞處加一個(gè)漏字符號(∧), 并在其下面寫出該加的詞。

刪除：把多余的詞用斜線(＼)劃掉。

修改：在錯(cuò)的詞下畫一橫線, 并在該詞下面寫出修改后的詞。

注意：1. 每處錯(cuò)誤及其修改均僅限一詞。

2. 只允許修改10處, 多者(從第11處起)不計(jì)分。

One year ago, I was in great trouble. I work hard at English and devoted all my spare time to practise it. But I failed to pass the mid-term exam, which made me great disappointed. So I asked my grandpa for advice when I got to home. Hearing that I told him, he said, “To some extent, exam results sometime can’t truly reflect your ability. You can’t judge your progress by one examination.” He encouraged myself to work hard for long time to check my results. I took my grandpa’s advice. Now my English is much better than ago. From my experience, I feel that we should listen to opinion from old people.

查看答案和解析>>

科目：高中英語 來源：2016屆河北正定中學(xué)高三上學(xué)期第五次月考英語試卷（解析版） 題型：閱讀理解

閱讀理解

When I was growing up, I had an old neighbor named Doctor Gibbs. He didn’t look like any doctor I’d ever known. He never yelled at us for playing in his yard, but was always very kind.

When Doctor Gibbs wasn’t saving lives, he was planting trees. His house sat on ten acres, and his life’s goal was to make it a forest. He had some interesting theories about planting trees. He hardly watered his new trees, which flew in the face of conventional wisdom. Once I asked why and he told me that watering plants spoiled them because it made them grow weaker. He said you had to make things tough for the trees so that only the strongest could survive. He talked about how watering trees made them develop shallow roots and how, if they were not watered, trees would grow deep roots in search of water. So, instead of watering his trees every morning, he’d beat them with a rolled-up newspaper. I asked him why he did that, and he said it was to get the tree’s attention.

Doctor Gibbs died a couple of years after I left home. Every now and then, I walked by his house and looked at the trees that I’d watched him plant some twenty five years ago. They were all tall, big and robust since they have deep roots now.

I planted a couple of trees myself a few years ago. Two years of attending these trees meant they grew up weak. Whenever a cold wind blew, their branches trembled. Adversity(逆境) seemed to benefit Doctor Gibb’s trees in ways comfort and ease never could.

Every night before I go to bed, I check on my two sons. I often pray that their lives will be easy. But lately I’ve been thinking that it’s time to change my prayer. I know my children are going to meet with hardship. There’s always a cold wind blowing somewhere. What we need to do is to pray for deep roots, so when the rains fall and the winds blow, we won’t be torn apart.

1.With the trees planted, Doctor Gibbs __________

A. kept watering them every morning

B. paid little attention to them

C. talked to them to get their attention

D. beat them to make them grow deep roots

2.The underlined word “robust” in para.3 probably means _________?

A. strange B. deep C. strong D. old

3. Which of the following will be the author’s prayer on the days ahead?

A. Have an easy life, without too much to worry about.

B. Meet people like Dr. Gibbs in the future.

C. Have good luck, encountering less hardship in their life.

D. Be able to stand the rain and wind in their lives.

4.Which of the following can be the best title of the passage?

A. Growing roots

B. Doctor Gibbs and his trees

C. Prayers for my sons

D. Watering trees

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年天津靜海第一中學(xué)高二12月調(diào)研英語試卷（解析版） 題型：單項(xiàng)填空

David asked his nephew to ______ his bag while he headed for a drink at the airport.

A. lose interest in B. keep an eye on

C. look away from D. keep in touch with

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年湖南瀏陽第一中學(xué)高二上月考3英語試卷（解析版） 題型：閱讀理解

Exploit your parking space

An unused parking space or garage can make money. If you live near a city center or an airport, you could make anything up to ￡200 or ￡300 a week. Put an advertisement for free on Letpark or Atmyhousepark.

Rent（出租）a room

Spare room Not only will a lodger（房客）earn you an income, but also, thanks to the government-backed “rent a room” program, you won’t have to pay any tax on the first ￡4500 you make per year. Try advertising your room on Roomspare or Roommateeasy.

Make money during special events

Don’t want a full-time lodger? Then rent on a short-term basis. If you live in the capital, renting a room out during the Olympics or other big events could bring in money. Grashpadder can advertise your space

Live on set

Renting your home out as a “film set” could earn you hundreds of pounds a day, depending on the film production company and how long your home is needed. A quick search on the Internet will bring up dozens of online companies that allow you to register your home for free—but you will be charged if your home gets picked.

Use your roof

You need the right kind of roof, but some energy companies pay the cost of fixing solar equipment (around ￡14,000), and let you use the energy produced for nothing. In return, they get paid for unused energy fed back into the National Grid. However, you have to sign a 25-year agreement with the supplier, which could prevent you from changing the roof.

1.If you earn ￡5000 from renting a room in one year, the tax you need to pay will be based on______.

A. ￡800 B. ￡500 C. ￡4500 D. ￡5000

2.If you want to use energy free, you have to_____.

A. sign an agreement with the government

B. pay around ￡14,000 for the equipment

C. sell the roof to some energy companies

D. keep the roof unchanged for within 25 years

3.For whom the text most probably written？

A. Lodgers. B. Advertisers.

C. House owners. D. Online companies

查看答案和解析>>

同步練習(xí)冊答案