Passage 2

A:The Economy in Russia B:The Birth of Communism C:The Tsar Nicholas Ⅱ D:Lenin, Head of State

Twitter, the micro-blogging service used by tens of millions of people, went off-line last month. It blamed the trouble on a malicious programmer in Russia who was trying to shut down the account of a user in neighboring Georgi

A:a. It is astonishing the local actions of a small number of programmers can bring an entire Internet service to its knees, but that appears to have been the case. B:Who was responsible for the collapse of Twitter All its users. A malicious programmer in Russia. A small number of programmers. A user in neighboring Georgia,

Defective Genes and Human Health Each of us carries about half a dozen defective(有缺点的) genes. We remain blissfully(快乐地) unaware of this fact unless we, or one of our close relatives, are amongst the many millions who suffer from a genetic disease. About one in ten people has, or will develop at some later stage, an inherited(遗传的)genetic disorder, and approximately 2,800 specific conditions are known to be caused by defects (mutations) in just one of the patient’’s genes. Some single gene disorders are quite common-—cystic(胞状的) fibrosis (纤维化) is found in one out of every 2,500 babies born in the Western World—and in total, diseases that can be traced to single gene defects account for about 5% of all admissions to children’’s hospitals. Most of us do not suffer any harmful effects from our defective genes because we carry two copies of nearly all genes, one derived from our mother and the other from our father. The only exceptions to this rule are the genes found on the male sex chromosomes (染色体) Males have one X and one Y chromosome, the former from the mother and the latter from the father, so each cell has only one copy of the genes on these chromosomes. In the majority of cases, one normal gene is sufficient to avoid all the symptoms of disease. If the potentially harmful gene is recessive(后退的), then its normal counterpart(配对的) will carry out all the tasks assigned to both. Only if we inherit from our parents two copies of the same recessive gene will a disease develop. On the other hand, if the gene is dominant(显性的), it alone can produce the disease, even if its counterpart is normal. Clearly only the children of a parent with the disease can be affected, and then average only half the children will be affected. Huntington’’s chorea (舞蹈病) , a severe disease of the nervous system, which becomes apparent only in adulthood, is an example of a dominant genetic disease. Finally, there are the X chromosome-linked genetic diseases. As males have only one copy of the genes from this chromosome, there are no others available to fulfill the defective gene’’s function. Examples of such diseases are Duchenne muscular dystrophy(营养不良) and, perhaps most well known of all, hemophilia(血友病). Queen Victoria was a carrier of the defective gene responsible for hemophilia, and through her it was transmitted to the royal families of Russia, Spain, and Prussia. Minor cuts and bruises, which would do little harm to most people, can prove fatal to hemophiliacs, who lack the proteins(Factors VIII and IV) (凝血因子VIII和IV)involved in the clotting(血凝结)of blood, which are coded for by the defective genes. Sadly, before these proteins were made available through genetic engineering, hemophiliacs were treated with proteins isolated from human blood. Some of this blood was contaminated(污损) with the AIDS virus, and has resulted in tragic(悲惨的) consequences for many hemophiliacs. Use of genetically engineered proteins in the rapeutic applications, rather than blood products, will avoid these problems in the future. Not all defective genes necessarily produce detrimental(有害的)effects, since the environment in which the gene operates is also of importance. A classic example of a genetic disease having a beneficial effect on survival is illustrated by the relationship between sickle-cell,(镶形血球)anemia (贫血症) and malaria(疟病). Only individuals having two copies of the sickle-cell gene and one normal gene are unaffected and, more importantly, are able to resist infection(传染) by malarial parasites (寄生虫). The clear advantage, in this case, of having one defective gene explains why this gene is common in populations in those areas of the world where malaria is endemic(特有的). Which of the following royal families was not affected by hemophilia through Queen Victoria?

A:Russia B:Spain C:England D:Thailand

Defective Genes and Human Health Each of us carries about half a dozen defective(有缺点的) genes. We remain blissfully(快乐地) unaware of this fact unless we, or one of our close relatives, are amongst the many millions who suffer from a genetic disease. About one in ten people has, or will develop at some later stage, an inherited(遗传的)genetic disorder, and approximately 2,800 specific conditions are known to be caused by defects (mutations) in just one of the patient’’s genes. Some single gene disorders are quite common-—cystic(胞状的) fibrosis (纤维化) is found in one out of every 2,500 babies born in the Western World—and in total, diseases that can be traced to single gene defects account for about 5% of all admissions to children’’s hospitals. Most of us do not suffer any harmful effects from our defective genes because we carry two copies of nearly all genes, one derived from our mother and the other from our father. The only exceptions to this rule are the genes found on the male sex chromosomes (染色体) Males have one X and one Y chromosome, the former from the mother and the latter from the father, so each cell has only one copy of the genes on these chromosomes. In the majority of cases, one normal gene is sufficient to avoid all the symptoms of disease. If the potentially harmful gene is recessive(后退的), then its normal counterpart(配对的) will carry out all the tasks assigned to both. Only if we inherit from our parents two copies of the same recessive gene will a disease develop. On the other hand, if the gene is dominant(显性的), it alone can produce the disease, even if its counterpart is normal. Clearly only the children of a parent with the disease can be affected, and then average only half the children will be affected. Huntington’’s chorea (舞蹈病) , a severe disease of the nervous system, which becomes apparent only in adulthood, is an example of a dominant genetic disease. Finally, there are the X chromosome-linked genetic diseases. As males have only one copy of the genes from this chromosome, there are no others available to fulfill the defective gene’’s function. Examples of such diseases are Duchenne muscular dystrophy(营养不良) and, perhaps most well known of all, hemophilia(血友病). Queen Victoria was a carrier of the defective gene responsible for hemophilia, and through her it was transmitted to the royal families of Russia, Spain, and Prussia. Minor cuts and bruises, which would do little harm to most people, can prove fatal to hemophiliacs, who lack the proteins(Factors VIII and IV) (凝血因子VIII和IV)involved in the clotting(血凝结)of blood, which are coded for by the defective genes. Sadly, before these proteins were made available through genetic engineering, hemophiliacs were treated with proteins isolated from human blood. Some of this blood was contaminated(污损) with the AIDS virus, and has resulted in tragic(悲惨的) consequences for many hemophiliacs. Use of genetically engineered proteins in the rapeutic applications, rather than blood products, will avoid these problems in the future. Not all defective genes necessarily produce detrimental(有害的)effects, since the environment in which the gene operates is also of importance. A classic example of a genetic disease having a beneficial effect on survival is illustrated by the relationship between sickle-cell,(镶形血球)anemia (贫血症) and malaria(疟病). Only individuals having two copies of the sickle-cell gene and one normal gene are unaffected and, more importantly, are able to resist infection(传染) by malarial parasites (寄生虫). The clear advantage, in this case, of having one defective gene explains why this gene is common in populations in those areas of the world where malaria is endemic(特有的). Which of the following royal families was not affected by hemophilia through Queen Victoria?

A:Russia B:Spain C:England D:Thailand

Questions from 31 to 35 are based on the following passage: China’s trade volume surged in 2010. The development wasn’t only in quantity, but also in quality — namely structure diversification. The European Union, the United States and Japan remained China’s top 3 largest trading partners in 2010. But trade volumes between China and other emerging economies increased also. Bilateral trade volumes between China and other BRIC nations — Brazil, Russia and India — all jumped more than 40 percent. That made India China’s tenth largest trading partner. Huang Guohua, Statistics Department Director of General Administration of Customs said “Trade volume between China and emerging economies increased faster than that with the traditional market. It indicates that China’s foreign trade is diversifying, and showing less dependence on the traditional partners. It’s a good way to reduce risks.” Data also shows that foreign trade volumes developed dramatically in China’s middle and western areas last year. Although the southern province of Guangdong still topped others in the total volume of import and export. Huang Guohua said “The export volume of middle and western areas surged over 40 percent year on year in 2010. The speed was 10 percentage points higher than the country’s total. It indicates that industrial structure has improved in these areas.” The import and export volume of private enterprises surged faster than the country’s average in 2010, with 47 percent year on year growth. Experts say China’s foreign trade development reduced dependence on foreign-funded enterprises. 2010 imports and exports reached a historical high with a strong sign that the country’s trade sector has shrugged off the global economic recession. According to the passage, what does the word “BRIC ” mean （ ）

A:Brazil, Russia , India and China B:Britain, Romania , Italy and Canada C:Bulgaria, Russia , Indonesia and Colombia D:Belgium, Romania , Israel and Cuba

Questions from 36 to 40 are based on the following passage: China’s trade volume surged in 2010. The development wasn’t only in quantity, but also in quality — namely structure diversification. The European Union, the United States and Japan remained China’s top 3 largest trading partners in 2010. But trade volumes between China and other emerging economies increased also. Bilateral trade volumes between China and other BRIC nations — Brazil, Russia and India — all jumped more than 40 percent. That made India China’s tenth largest trading partner. Huang Guohua, Statistics Department Director of General Administration of Customs said “Trade volume between China and emerging economies increased faster than that with the traditional market. It indicates that China’s foreign trade is diversifying, and showing less dependence on the traditional partners. It’s a good way to reduce risks.” Data also shows that foreign trade volumes developed dramatically in China’s middle and western areas last year. Although the southern province of Guangdong still topped others in the total volume of import and export. Huang Guohua said “The export volume of middle and western areas surged over 40 percent year on year in 2010. The speed was 10 percentage points higher than the country’s total. It indicates that industrial structure has improved in these areas.” The import and export volume of private enterprises surged faster than the country’s average in 2010, with 47 percent year on year growth. Experts say China’s foreign trade development reduced dependence on foreign-funded enterprises. 2010 imports and exports reached a historical high with a strong sign that the country’s trade sector has shrugged off the global economic recession. According to the passage, what does the word “BRIC ” mean （ ）

A:Brazil, Russia , India and China B:Britain, Romania , Italy and Canada C:Bulgaria, Russia , Indonesia and Colombia D:Belgium, Romania , Israel and Cuba