Can eating a chocolate bar every day really prevent age-related memory loss? No. But a new research shows that large amounts of flavones, substances found in cocoa, tea and some kinds of vegetables, m 题目和参考答案——青夏教育精英家教网—

题目内容

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

Dr. Scott Small is a professor of neurology (神经病学) 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(胶囊). 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

Dr. Manson says it's not necessary for people to start eating more chocolate, because a person 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(提取)may 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 capsules containing flavones.

C. They were given brain imaging and memory tests.

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 prove the first experiment is wrong.

B. To carry out the experiment further.

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

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

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

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What is a big dream ? 1.________ Or , is a big dream something that provides only entertainment? Children dream big dreams, but there are three barriers to realizing dreams. They often kill them before they ever have a chance to grow.

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3.________

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“Shall we take a ________ ?” asked his mother.

“Oh, yes!” said Gilbert. “We may see that wolf in the forest. But don’t be ________.”

His mother smiled, ________ she felt quite sure that there was no ________ .

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4.A. tiger B. lion C. bear D. wolf

5.A. thoughts B. questions C. plans D. complaints

6.A. bath B. picture C. walk D. break

7.A. tired B. afraid C. cruel D. surprised

8.A. so B. once C. but D. for

9.A. danger B. wonder C. use D. point

10.A. sing B. read C. sleep D. draw

11.A. give up B. worry about C. look for D. ask about

12.A. angrily B. hurriedly C. proudly D. carefully

13.A. finally B. suddenly C. gradually D. strangely

14.A. listened B. cried C. waited D. watched

15.A. close B. familiar C. blind D. harmful

16.A. stone B. wall C. tree D. ground

17.A. defeated B. bothered C. frightened D. hurt

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Every December since then, the topic of Christmas memories would unavoidably come up, and I would amuse my friends with my poor-little-me story. I had to make it as funny as possible, or else I would cry.

How could I know that Santa was just late? Nine years ago, on Christmas Eve, an older man with a white beard and a red cap knocked on my front door. He said, “I’ve been looking for you for twenty-five years.” He handed me a bulging red stocking, winked, and left. On top of the stocking was a card. It read: “For Becky—I may have missed you in the second grade, but you’ve always lived in my heart. Santa.”

Through tear-blurred eyes, I recognized the handwriting of Jill, a friend I had met just two months before. I later discovered that the older man was her father. Jill had seen the hurt little girl underneath the thirty-something woman and decided to do something about it.

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D. didn’t have enough money to buy the author Christmas presents

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C. a middle-aged woman D. a native American

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I have taught many children who held the belief that their self-worth relied on how well they performed at tennis and other skills. For them, playing well and winning are often life-and-death affairs. In their single-minded pursuit of success, the development of many other human qualities is sadly forgotten.

However, while some seem to be lost in the desire to succeed, others take an opposite attitude. In a culture which values only the winner and pays no attention to the ordinary players, they strongly blame competition. Among the most vocal are youngsters who have suffered under competitive pressures from their parents or society. Teaching these young people, I often observe in them a desire to fail. They seem to seek failure by not trying to win or achieve success. By not trying, they always have an excuse: “I may have lost, but it doesn’t matter because I really didn’t try.” What is not usually admitted by themselves is the belief that if they had really tried and lost, that would mean a lot. Such a loss would be a measure of their worth. Clearly, this belief is the same as that of the true competitors who try to prove themselves. Both are based on the mistaken belief that one’s self-respect relies on how well one performs in comparison with others. Both are afraid of not being valued. Only as this basic and often troublesome fear begins to dissolve can we discover a new meaning in competition.

1.What does this passage mainly talk about?

A. Competition helps to set up self-respect.

B. Opinions about competition are different among people.

C. Competition is harmful to personal quality development.

D. Failures are necessary experiences in competition

2.Why do some people favor competition according to the passage?

A. It pushes society forward.

B. It builds up a sense of duty.

C. It improves personal abilities.

D. It encourages individual efforts.

3.What is the similar belief of the true competitors and those with a desire to fail ?

A. One’s worth lies in his performance compared with others.

B. One’s success in competition needs great efforts.

C. One’s achievement is determined by his particular skills.

D. One’s success is based on how hard he has tried.

4.Which point of view may the author agree to?

A. Every effort should be paid back.

B. Competition should be encouraged.

C. Winning should be a life-and-death matter.

D. Fear of failure should be removed in competition.

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Mao Zedong wrote a poem in which he dreamed of “walls of stone to 1. back clouds and rain till a2. lake rises in the 3. gorges”. Now his dream has come 4.. The power of the Yangtze River, which is the world’s third 5.river, has been harnessed by the Three Gorges Dam.

A．Means of e?waste recycling

B．How e?waste comes into being

C．The benefit of e?waste recycling

D．The technologies of e?waste recycling

E．The importance of the electronic waste recycle

F．Modern technology brings convenience and e?waste

Modern technology does bring us many conveniences（便利），from Wi?Fi（无线网络）enabled cell phones and ever? smaller laptop computers that make entire lives easy to energy? efficient washers that use half the power and time to complete their tasks. However，these new toys and equipment finally become electronic waste （电子垃圾）（e? waste）once they are out of use.

E? waste includes everything from empty printer ink containers to broken refrigerators. As people buy new items to replace aging electronics or make upgrades（升级），more electronic waste comes into being. In some cases，such as 2009's switch from analog（模拟）to digital television broadcasting in the United States，changes in technology are so great that old equipment may not even work at all with new systems.

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