单选题I recommend you buy a computer.

单选题Language and Communication A language is a signaling system which operates with symbolic vocal sounds(语声), and which is used by a group of people for the purpose of communication. Let's look at this (51) in more detail because it is language, more than anything else, (52) distinguishes man from the rest of the physical world. Other animals, it is true, communicate with one another by (53) of cries, for example, many birds utter (54) calls at the approach of danger; monkeys utter (55) cries, such as expressions of anger, fear and pleasure. (56) these various means of communication differ in important ways from human language. For instance, animals' cries do not (57) thoughts and feelings clearly. This means, basically, that they lack structure. They lack the kind of structure that (58) us to divide a human utterance into (59) We can change an utterance by replacing one word in it with (60) : a good illustration of this is a soldier who can say, e.g., "tanks approaching from the north", (61) who can change one word and say "aircraft approaching from the north" or "tanks approaching from the west"; but a bird has a single alarm cry, (62) means "danger!" This is why the number of signals that an animal can make is very limited: the great tit (山雀) is a case (63) point; it has about twenty different calls, (64) in human language the number of possible utterances is limitless. It also explains why animal cries are very (65) in meaning.

单选题It is said the houses along this street will soon be demolished.A. pulled downB. pulled upC. pulled offD. pulled in

单选题He {{U}}purchased{{/U}} a ticket and went up on the top deck. A. bought B. took C. showed D. made

单选题I was deeply impressed by the Uassurance/U with which the student answered all my questions.

单选题A tuning fork is a narrow, two-pronged steel bar that when tuned to a specific musical pitch retains its tuning almost indefinitely .

单选题The nursery is bright and cheerful .

单选题Many students were absent, notably the monitor.

单选题According to Dr . David Faxon, the self-contained heart is

单选题The layout of the book, with the text on the left and the notes on the right, makes it a pleasure to use. A. design B. method C. style D. system

单选题The Wasteland A new catastrophe faces Afghanistan. The American bombing campaign is conspiring with years of civil conflict and drought to create an environmental crisis. Humanitarian and political concerns are dominating the headlines. But they are also masking the disappearance of the country"s once rich habitat and wildlife, which are quietly being crushed by war. The UN is dispatching a team of investigators to the region next month to evaluate the damage. "A healthy environment is a prerequisite for rehabilitation," says Klaus Topfer, head of the UN Environment Programme. Much of south-east Afghanistan was once lush forest watered by monsoon rains. Forests now cover less than 2 percent of the country. "The worst deforestation occurred during Taliban rule, when its timber mafia denuded forests to sell to Pakistani markets," says Usman Qazi, an environmental consultant based in Quetta, Pakistan. And the intense bombing intended to flush out the last of the Taliban troops is destroying or burning much of what remains. The refugee crisis is also wrecking the environment, and much damage may be irreversible. Forests and vegetation are being cleared for much-needed farming, but the gains are likely to be only short-term. "Eventually the land will be unfit for even the most basic form of agriculture," warns Hammad Naqi of the World Wide Fund for Nature in Pakistan. Refugees—around 4 million as the last count—are also cutting into forests for firewood. The hail of bombs falling on Afghanistan is making life particularly hard for the country"s wildlife. Birds such as the pelican and endangered Siberian crane cross eastern Afghanistan as they follow one of the world"s great migratory thoroughfares from Siberia to Pakistan and India. But the number of the birds flying across the region has dropped by a staggering 85 percent. "Cranes are very sensitive and they do not use the route if they see any danger," says Ashiq Ahgmad, an environmental scientist for the WWF in Peshawar, Pakistan, who has tracked the collapse of the birds" migration this winter. The rugged mountains also usually provide a safe haven for mountain leopards, gazelles, bears and Marco Polo sheep—the world"s largest species. "The same terrain that allows fighters to strike and disappear back into the hills has also historically enabled wild life to survive," says Peter Zahler of the Wildlife Conservation society, based in New York. But he warns they are now under intense pressure from the bombing and invasions of refugees and fighters. For instance, some refugees are hunting rare snow leopards to buy a safe passage across the border. A single fur can fetch $2,000 on the black market, says Zahler. Only 5,000 or so snow leopards are thought to survive in central Asia and less than 100 in Afghanistan, their numbers already decimated by extensive hunting and smuggling into Pakistan before the conflict. Timber, falcons and medicinal plants are also being smuggled across the border. The Taliban once controlled much of this trade, but the recent power vacuum could exacerbate the problem. Bombing will also leave its mark beyond the obvious craters. Defence analysts say that while depleted uranium has been used less in Afghanistan than in the Kosovo conflict, conventional explosives will litter the country with pollutants. They contain toxic compounds such as cyclonite, a carcinogen, and rocket propellants contain perchlorates, which damage thyroid glands.

单选题 阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子作出判断。如果该句提供的是正确信息，请选择A项：如果该句提供的错误信息，请选择B项；如果该句的信息文章中没有提及，请选择C项。 {{B}} Dyslexia{{/B}} As many as 20% of all children in the United States suffer from some form of the learning disorder called dyslexia. Experts on dyslexia say that the problem is not a disease. They say that persons with dyslexia use information in a different way. One of the world's great thinkers and scientists. Albert Einstein was dyslexic. Einstein said that he never thought in words the way that most people do. He said that he thought in pictures instead. The American inventor Thomas Edison was also dyslexic. Dyslexia first was recognized in Europe and the United States more than 80 years ago. Many years passed before doctors discovered that persons with the disorder were not mentally slow or disabled. The doctors found that the brains of persons with dyslexia are different. In most people, the left side of the brain--the part that controls language is larger than the right side. In persons with dyslexia, the right side of the brain is bigger. Doctors are not sure what causes this difference. However, research has shown that dyslexia is more common in males than in females, and it is found more often in persons who are left handed4. No one knows the cause of dyslexia, but some scientists believe that it may result from chemical changes in a baby's body long before it is born. They are trying to find ways to teach persons with dyslexia. Dyslexic persons think differently and need special kinds of teaching help. After they have solved their problems with language, they often show themselves to be especially intelligent or creative.

单选题Hearing problems may be alleviated by changes in diet and exercise habits.

单选题My room is really very {{U}}cosy{{/U}}.

单选题Her words Uoffended/U me.

单选题According to the passage, the risk of a child developing insulin-dependent diabetes is linked to all the following factors EXCEPT

单选题Academic records cannot be duplicated .

单选题It"s almost impossible to find him in the immense ocean.

单选题UUp to now/U, the work has been easy.

单选题{{B}}第三篇{{/B}} Without regular supplies of some hormones our capacity to behave would be seriously impaired; without others we would soon die. Tiny amounts of some hormones can modify our moods and our action, our inclination to eat or drink, our aggressiveness or submissiveness, and our reproductive and parental behavior. And hormones do more than influence adult behavior; early in life they help to determine the development of bodily form and may even determine an individual's behavioral capacities. Later in life the changing outputs of some endocrine glands and the body's changing sensitivity to some hormones are essential aspects of the phenomena of aging. Communication within the body and the consequent integration of behavior were considered the exclusive province of the nervous system up to the beginning of the present century. The emergence of endocrinology as a separate discipline can probable be traced to the experiments of Bayliss and Starling on the hormone secretion. This substance is secreted from cells in the intestinal walls when food enters the stomach; it travels through the bloodstream and stimulates the pancreas to liberate pancreatic juice, which aids in digestion. By showing that special cells secrete chemical agents that are conveyed by the bloodstream and regulate distant target organs or tissues, Bayliss and Starling demonstrated that chemical integration can occur without participation of the nervous system. The term "hormone" was first used with reference to secretion. Starling derived the term from the Greek hormone, meaning "to excited or set in motion." The term "endocrine" was introduced shortly thereafter, "Endocrine" is used to refer to glands that secrete products into the bloodstream. The term "endocrine" contrasts with "exocrine" which is applied to glands that secrete their products through ducts to the site of action. Examples of exocrine glands are the tear glands, the sweat glands, and the pancreas, which secretes pancreatic juice through a duct into intestine. Exocrine glands are also called duct glands, while endocrine glands are called ductless.