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A review of cell phone studies commissioned by the Swedish Radiation Protection Authority has found no “consistent evidence” of an increased risk of cancer from usage, the agency said.Studies have differed on whether the use of mobile phones increases the risk of cancer as the handsets have become increasingly popular and efficient.The governmental agency asked Dr. John D. Boice Jr. and Dr. Joseph K. McLaughlin of the International Epidemiology Institute in Rockville, Md., to evaluate published epidemiological research on the subject.The review looked at nine studies since 1996 that included factors such as type of phone, duration and frequency of use and brain tumor location.“No consistent evidence was observed for increased risk of brain cancer (or other forms),” the scientists said in the review, released Wednesday.The agency acknowledged public concern about the issue and said many studies were still being performed and continued follow-up was needed on any possible carcinogenic effect linked to mobile phone usage.
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更多 “问答题A review of cell phone studies commissioned by the Swedish Radiation Protection Authority has found no “consistent evidence” of an increased risk of cancer from usage, the agency said.Studies have differed on whether the use of mobile phones increases the risk of cancer as the handsets have become increasingly popular and efficient.The governmental agency asked Dr. John D. Boice Jr. and Dr. Joseph K. McLaughlin of the International Epidemiology Institute in Rockville, Md., to evaluate published epidemiological research on the subject.The review looked at nine studies since 1996 that included factors such as type of phone, duration and frequency of use and brain tumor location.“No consistent evidence was observed for increased risk of brain cancer (or other forms),” the scientists said in the review, released Wednesday.The agency acknowledged public concern about the issue and said many studies were still being performed and continued follow-up was needed on any possible carcinogenic effect linked to mobile phone usage.” 相关考题
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单选题What does the author feel about the vanishing languages throughout the world?A
Concerned.B
Indifferent.C
Pleased.D
Sympathetic.
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单选题This passage suggests that the U.S. parentsA
do not respect orders.B
do not trust their schools.C
should pick up their children first in case of evacuation.D
will protect their children at all cost.
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问答题Directions： Please write an essay in about 150 words entitled “On Electronic Dictionary” based on the following outline （1）Advantages of electronic dictionary. （2）Disadvantages of using electronic dictionary. （3）Your opinion.
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问答题Pollution is a problem because man, in an increasingly populated and industrialized world, is upsetting the environment in which he lives. Many scientists maintain that one of man’s greatest errors has been to equate growth with advancement. Now “growth” industries are being looked on with suspicion in case their side effects damage the environment and disrupt the relationship of different forms of life. The growing population makes increasing demands on the world’s fixed supply of air, water and land. This rise in population is accompanied by the desire of more and more people for a better standard of living. Thus still greater demands for electricity, water and goods result in an ever increasing amount of waste material to be disposed of.The problem has been causing increasing concern to living things and their environment. Many believe that man is not solving these problems quickly enough and that his selfish pursuit of possessions takes him past the point of no return before be fully appreciates the damage.
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问答题Since Darwin, biologists have been firmly convinced that nature works without plan or meaning, pursuing no aim by the direct road of design. But today we see that this conviction is a fatal error. Why should evolution, exactly as Darwin knew it and described it, be planless and irrational? Do not aircraft design engineers work, at precisely that point where specific calculations and plans give out, according to the same principle of evolution, when they test the serviceability of a great number of statistically determined forms in the wind tunnel, in order to choose the one that functions best? Can we say that there is no process of natural selection when nuclear physicists, through thousands of computer operations, try to find out which materials, in which combinations and with what structural form, are best suited to the building of an atomic reactor? They also practise no designed adaptation, but work by the principle of selection. But it would never occur to anyone to call their method planless and irrational.
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单选题It can be inferred from the second paragraph that______.A
low-altitude clouds are the main causes of global warming.B
increase of cloud cover can slow down the climate change.C
global warming will increase cloud cover.D
increase of cloud cover can speed up the global warming.
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问答题Directions: Suppose you are Li Ming and your friend Li Hua has just won the first-class science award because of the work in the field of applied chemistry. Write a letter of congratulation to her, and the letter should include the following information: （1）express your congratulations on the award-winning. （2）express your opinion that she deserves the award. （3）express your hope for greater success in her field. You should write about 100 words. Do not sign your own name at the end of the letter. Use “Li Ming” instead. You do not need write the address.
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问答题1) Italymay be facing economic depression, but for Siggi, a textile firm near Vicenza in the north-east of the country, 2009 offers the promise of unprecedented growth.Siggi is the biggest producer of grembiuli, or school smocks. Once universal in Italian primary schools, they were becoming as outdated as ink-wells. But in July the education minister, Mariastella Gelmini, backed the reintroduction of grembiuli to combat brand- and class-consciousness among schoolchildren. Siggi’s output this year has almost sold out and its chairman, Gino Marta, says that “next year could see an out-and-out boom.” The decision on whether pupils should wear the grembiule has been left to head teachers. 2) It does not figure in either of the two education bills that have been introduced by Ms Gelmini. But it has become a symbol of her efforts to shake up Italian education. Her critics argue that these are a vain attempt to turn back the clock; her supporters see them as a necessary first step to a more equitable, efficient system. 3) On October 30th the opposition she has aroused will reach its peak by a one-day teachers’ strike. The union’s main complaint is a program of cuts aimed at saving almost ￡8 billion ($11 billion). It includes the loss by natural wastage of 87,000 teachers’ jobs over the three academic years to 2012 and the return to a system in which just one teacher is allotted to each year of elementary school. 4) If this is all the reforms do, they could prove as disastrous as union and opposition leaders predict (international studies find primary schools are the only part of Italy’s education that does well). But it is also planned that 30% of the money saved will be reinvested in schools. Ms Gelmini’s supporters hope that she will use it to redress the crippling imbalances in education, which is one of Italy’s biggest structural economic weaknesses. One problem is “lots of badly paid teachers”, says Roger Abravanel, author of a recent book on meritocracy. “The number of teachers per 100 students is one of the highest in the OECD. “Education, particularly in the south, has often been used by politicians for patronage and job creation. 5) This may explain why, despite studying for longer and in smaller classes, Italian secondary pupils do badly in international comparisons.“The north is around the OECD average, but the south is on a par with Uruguay and Thailand,” says Mr Abravanel. Giacomo Vaciago, an economics professor at the Catholic University of Milan, says that “although for the time being the debate is about cuts, the big problem is quality, which is random.” Presenting the latest reforms alongside Ms Gelmini, Italy’s prime minister, Silvio Berlusconi, promised that, by 2012, the best teachers would be getting a 7,000 bonus. But Mr Vaciago is unconvinced by the plans. “The present government is making cuts and hoping that the quality comes through as a result. There is no obvious guarantee it will,” he comments.(此文选自The Economist 2008年刊)
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