Science Daily (Apr 27, 2008) — Dutch ecologist Roxina Soler and her colleagues have discovered that subterranean (地下的) and aboveground herbivorous (食草的) insects can communicate with each other by using plants as telephones. Subterranean insects issue chemical warning signals through the leaves of the plant. This way, aboveground insects are warned that the plant is already “occupied”.
Aboveground, leaf-eating insects prefer plants that have not yet been occupied by subterranean root-eating insects. Subterranean insects send out chemical signals through the leaves of the plant, which warn the aboveground insects about their presence. This messaging makes it possible for spatially-separated insects to avoid each other, so that they do not compete for the same plant.
In recent years it has been discovered that different types of aboveground insects develop slowly if they feed on plants that also have subterranean residents and vice versa (反之亦然). It seems that a system has developed through natural selection, which helps the subterranean and aboveground insects to notice each other. This avoids unnecessary competition.
Through the “green telephone lines”, subterranean insects can also communicate with a third party, namely the natural enemy of caterpillars (毛虫). Parasitic wasps (寄生的黄蜂) lay their eggs inside aboveground insects. The wasps also benefit from the signals sent by the leaves, as these help them find more insects for their eggs.
The communication between subterranean and aboveground insects has only been studied in a few cases. It is still not clear how widespread this phenomenon is. But scientists are looking into it. This research was carried out at the Netherlands Institute for Ecology (NIOO-KNAW) by Roxina Soler, Jeffrey Harvey, Martijn Bezemer, Wim van der Putten and Louise Vet. The PhD project, in which this study was carried out, was funded by the Free Competition of NWO Earth and Life Sciences.
51. After finding a plant occupied by subterranean insects, aboveground insects usually ____.
A. send out warning signals             B. choose to give up the plant
C. compete for the plant               D. share it with the subterranean insects
52. Aboveground insects will develop more quickly if they ____.
A. feed on plants occupied by subterranean insects
B. feed on plants not occupied by subterranean insects
C. become cleverer through natural selection
D. compete with subterranean insects
53. Subterranean insects communicate with a third party through ____.
A. caterpillars     B. parasitic wasps    C. wasps’ eggs    D. a plant’s leaves
54. What can be inferred from the last paragraph?
A. Other animals may communicate in the same way.
B. There will be further research into this phenomenon.
C. Part of the study is a PhD project.
D. The Free Completion of NWO Earth and Life Sciences has the patent for these results.
55. What would be the best title for this passage?
A. Insects use plants as a telephone.         B. Insects live in harmony with each other.
C. No species can live alone.               D. Plants and animals have an effect on each other.

Fans of the British royal family around the world are making plans for April 29th, 2011. That’s the date that Prince William and Catherine Middleton are to tie the knot at Westminster Abbey in London.
A royal wedding is a rare and unique event in Britain so for many it’s something worth celebrating, particularly if you are in the business of making memorabilia (收藏品).
Producers of these souvenirs are wasting no time in manufacturing key rings, mugs, teapots and tea towels, mostly with the faces of the happy couple emblazoned on the front. These are the must buy items that royal followers want to get their hands on.
Some people may argue the royal wedding is a huge public cost but production and sale of memorabilia is good for business. Former politician, Lord Archer, has commented that, “In this age when we are trying to balance the books, the royal family are a great benefit to Great Britain Limited.”
A porcelain-making company, called Royal Crown Derby, is already manufacturing souvenir pottery. Louise Adams from the company says “we started designing, truly, about two years ago.” It is big business for China too, where much of the merchandise that marks the big event is made.
But why are people so keen to get their hands on a commemorative mug, so much so that one British supermarket has already seen them flying off the shelves?
Obviously, we like to remember an event like this and maybe it makes us feel as though we are part of the occasion. However their monetary value is likely to be low. Eric Knowles from the BBC’s Antiques Roadshow claims, “The vast majority of it will be worthless.”
Modern day souvenirs tend to be mass-produced making them cheap and easy to find. However limited edition or high-end items tend to keep their value and could be a better investment for the future.
But there is one thing we can guarantee that won’t be mass-produced and cheap. That’s the wedding dress for Princess Catherine, as Catherine Middleton will be known.
(   ) 【小题1】. From the first three paragraphs we can learn that         .

After the U.S. House of Representatives passed a bill aimed at retaliatory(报复的) action against China for its “significantly undervalued” currency, Treasury Secretary Timothy Geithner urged the IMF to pressure China to adopt “more flexible, more market-directed exchange-rate management”. This is a coded message to China: You’re keeping on purpose your currency cheap, and the U.S. economy is paying the price. So cut it out --- or else. The normally dull IMF meeting became the latest battleground for the U.S. to be against a fast developing China.
Our new conventional wisdom is that China’s policy leads to make trade deficits (逆差) greater and the loss of American jobs. Dozens of candidates have run ads attacking a competitor for allowing China to take advantage of us. In the election-year view, China grew 10% annually for the past decade while maintaining low inflation(通涨) only by taking advantage of its artificially low currency. The idea that the U.S. is not responsible for its own economy is a black-is-white view. It argues that China and its currency are causing the lion’s share of harm.
This is an argument born of fear. It covers a fact that the economies of China and the U.S. have become beneficial to each other. Those trillions in reserves that China accumulates: Where do they go? Back to the U.S. in the form of lending money to the federal government. Those made-in-China goods that account for the trade deficit: Whom do they benefit? China, yes, but also American consumers and companies. Without China, American companies could not have maintained their profitability in recent years. Take two brand names, Caterpillar and Nike. Both have their products made in China, but both also view China as a fast-growing market for their products.
George Soros warned recently that a currency war could put the world into disorder more damaging than anything caused by the financial crisis of the 1930s. He’s right. Whether we like it or not, we live in a global system. The zero-sum attitude toward China and its currency is a relic, the remaining of an earlier time when nations defined economic life.
China is far from perfect and seeks its own advantage, but holding it accountable for our domestic problems is beyond outdated. It reflects a dangerous refusal to deal with the world as it is. Retaliating against China over currency will not regain high-end jobs in the U.S., which needs more our own demand. It will not renew construction or retool the American labor force. It will not rebuild rotting bridges or create a next-generation energy network.
【小题1】Which of the following argument can be supported by the writer?

Edinburgh Zoo makes plans to bring a pair of giant pandas from China to Scotland. Representa-tives from Edinburgh Zoo have recently returned from China,where they signed a litter of intent(意向书)making a promise to bring giant pandas to the zoo.
It has been suggested that the breeding pair should be rented to the Royal Zoological Society of Scotland(RZSS)for10years and it is hoped they would give birth to babies during that time. Edin-burgh Zoo would be the eighth zoo in the West to care for the species if the project goes ahead.
Zoo chiefs said that looking after the endangered animals could benefit conservation. David Windmill，chief of RZSS，said，"It is an opportunity to work on a global level with other conserva-
tionists to gain a better understanding of the giant panda，the threats they face，and what we can do to ensure their survival."
At present，there are currently only around 1，500 giant pandas in the wild. RZSS has been working on the project for almost a year，and hopes to have giant pandas at Edinburgh Zoo by 2011,the year of the society`s centenary.
Mr. Windmill said that the project has received strong support from the UK and Seottish Gov-ernments and that this must continue if the zoo is to reach an agreement with the Chinese.As part of the proposed agreement with the Chinese government，Edinburgh Zoo will cooperate on research projects benefiting conservation in the wild.
RZSS will also provide considerable money to support giant panda conservation projects in the wild.Giant pandas live in a few mountain ranges in central China and feel almost wholly on  bamboo，which makes up 99% of the their diet.
61.What result did zoo representatives get from China？
A.A breeding pair is on loan to RZSS for ten years.
B.China promised to sell two giant pandas before 2011.
C.They signed a letter of intent about giant pandas to be loaned to Edinburgh Zoo.
D.China promised to offer the money but not the experts for research into giant pandas.
62.If Edinburgh Zoo can borrow giant pandas，what will happen？
A.RZSS will celebrate its centenary in 2011.
B.Scotland will be the eighth country to have giant pandas.
C.RZSS will have a better understanding of living habits of giant pandas.
D.Edinburgh Zoo will be the eighth zoo to have Chinese pandas in the world.
63.The underlined part "the prlject" in Paragraph 4 refers to "__________ ".
A.the celebration of RZSS`s centenary
B.introducing giant pandas to RZSS`s collection
C.the Royal Zoological Society of Scotland itself
D.Borrowing giant pandas from China for conservation
64.At present what seems to be the key factor for giant pandas to successfully go to Edinburgh Zoo?
A.RZSS`s attitude.
B.The Chinese government`s attitude.
C.Edinburgh Zoo`s support.
D.The Scottish government`s attitude.
65.The best title for this passage would be "__________ ".
A.Edinburgh Zoo expects giant pandas from China
B.Edinburgh Zoo does research into giant pandas
C.Scotland supports giant panda conservation
D.Giant pandas live happily at Edinburgh Zoo

FRIDAY, Aug. 3 (Health Day News) -- Middle school students who are physically fit are likely to score higher on standardized tests measuring reading and math abilities, a new study has found. And, the average scores went up in connection with levels of fitness, the findings showed.
“The more physically fit kids were, the higher their scores,” said the study’s lead author, Trent Petrie, director of the Center for Sport Psychology at the University of North Texas in Denton. “Parents should encourage their kids to be physically active. There are some real cognitive (认知的) and academic benefits that come from physical fitness”, Petrie said.
Results of the study are scheduled to be presented Friday at the annual meeting of the American Psychological Association in Orlando, Fla. The study included more than 1,200 middle school students from five schools in a suburban area of Texas, with 561 boys and 650 girls. About 57 percent of the children were white, and nearly one-quarter were Mexican American. Nine percent were black and about 2 percent were of Asian descent.
The school district provided the researchers with information on the children’s race, age, grade level and whether they qualified for the free school lunch program, which was an indicator of the family’s socioeconomic status. The schools also provided scores to the tests, which were given between one and four months after the researchers had assessed the children’s levels of fitness. Fitness tests were administered during physical education classes to determine the youngsters’ heart and lung health (cardiorespiratory fitness), as well as their body mass index (BMI), an indicator of how much body fat a person has. The children also filled out questionnaires that helped the researchers determine factors such as self-esteem and social support.
After accounting for factors such as age, sex, family income and self-esteem, the researchers found that for both boys and girls, higher levels of heart and lung health predicted better scores on both the math and reading tests.
For boys, perceived (感观的) social support also seemed to increase their reading scores, the investigators found. In girls, while being physically fit predicted higher reading scores, so too did a higher BMI-- which indicates more body fat. “We were a little surprised by this finding,” Petrie said.
“It was not as strong an association as the one with physical fitness,” he added. The authors suspect it may have something to do with girls this age entering adolescence, which may be related to a higher BMI and slightly higher brain development. He said he plans to make great effort to look for this relationship again in larger studies to see if it was a chance finding, or if the association holds up.
“While we can’t say 100 percent that physical fitness causes better academic performance, we can say that there is a strong and predictive relationship between physical fitness and academic performance,” Petrie said.
“It’s hard to tease apart (梳理) the exact reason for this association,” said Becky Hashim, an attending clinical psychologist and assistant professor in the departments of psychiatry and pediatrics at the Children’s Hospital of Montefiore, in New York City.
“It may be that the children are getting more oxygen. When the heart and lungs are working at a higher capacity, it may allow the brain to work at peak performance. Children who are less fit may be sleepier during school,” she noted. “I personally feel that there’s probably a strong relationship between the confidence you get from being able to do something physical well and academic performance.”
Whatever the reason behind this association may be, “there’s certainly no harm in pushing physical fitness,” Hashim added. “Physical fitness may make you feel better, give you more confidence and improve your performance across the board,” she said.
Petrie agreed. “Physically fit kids are happier, have higher self-esteem and, tend to have better relationships, and now we’re beginning to see that there also seem to be benefits cognitively and academically. Our study sends a strong warning to policymakers to reconsider the service program of physical education classes for kids,” he said.
【小题1】How did the school district help the researchers carry out the study?