题目内容
They liked the area, but they could not______the traffic noise.
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______your advice yesterday, I would have missed the train.
The main objective of the Molecular Genealogy Research Group is to build a database containing over 100,000 DNA samples from individuals all over the world. These individuals will have provided a pedigree chart of at least four generations and a small blood sample. Once the database has enough samples to represent the world genetic make-up, it will eventually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records. Theoretically, any individual will someday be able to trace his or her family origins through this database.
In the meantime, as the database is being created, molecular genealogy can already verify possible or suspected relationships between individuals. “For example, if two men sharing the same last name believe that they are related, but no written record proves this relationship, we can verify this possibility by collecting a sample of DNA from both and looking for common markers (in this case we can look primarily at the Y chromosome(染色体)),” explains Ugo A．Perego, a member of the BYU Molecular Genealogy research team.
People in a large area may possess the same DNA thread because______.
Part A
Directions: Read the following three texts. Answer the questions on each text by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1.
The predictability of our mortality rates is something that has long puzzled social scientists. After all, there is no natural reason why 2,500 people should accidentally shoot them- selves each year or why 7,000 should drown or 55,000 die in their cars. No one establishes a quota for each type of death. It just happens that they follow a consistent pattern year after year.
A few years ago a Canadian psychologist named Gerald Wilde became interested in this phenomenon. He noticed that mortality rates for violent and accidental deaths throughout the Western world have remained oddly static throughout the whole of the century, despite all the technological advances and increases in safety standards that have happened in that time. Wilde developed an intriguing theory called “risk homeostasis”. According to this theory, people instinctively live with a certain level of risk. When something is made safer, people will get around the measure in some way to reassert the original level of danger. If, for instance, they are required to wear seat belts, they will feel safer and thus will drive a little faster and a little more recklessly, thereby statistically canceling out the benefits that the seat belt confers. Other studies have shown that where an intersection is made safer, the accident rate invariably falls there but rises to a compensating level elsewhere along the same stretch of road. It appears, then, that we have an innate need for danger.
In all events, it is becoming clearer and clearer to scientists that the factors influencing our lifespan are far more subtle and complex than had been previously thought. It now appears that if you wish to live a long life, it isn't simply a matter of adhering to certain pre cautions—eating the right foods, not smoking, driving with care. You must also have the right attitude. Scientists at the Duke University Medical Center made a 15-year study of 500 persons personalities and found, somewhat to their surprise, that people with a suspicious or mistrustful nature die prematurely far more often than people with a sunny disposition. Looking on the bright side, it seems, can add years to your life span.
What social scientists have long felt puzzled about is why______.
The American need to own things is partly the result of mass advertising,【C1】______urges consumers to discard last year' s car or clothing in【C2】______of the current models with the latest designs. Some people are【C3】______that they must"【C4】______the Jones," that they must have whatever their neighbors have. The old car or the old stereo set【C5】______work perfectly, but a newer and bigger one might【C6】______the family' s esteem in the community. Possessions become【C7】______of financial success; they elevate【C8】______social status.
Advertisers also【C9】______to the American desire to look youthful and be physically attractive. Commercials attempt to sell many products—shampoo, toothpaste, deodorant and soap, for example—【C10】______implying that their particular【C11】______will help its user be more appealing.
But Americans also make many【C12】______for practical reasons. They buy【C13】______devices to do routine household chores more quickly and easily. Every housewife wants a vacuum cleaner, an electric mixer, a steam iron, an automatic clothes washer and dryer, and a dishwasher.【C14】______every home-owning husband would like a power lawn mower, as now -blower, and an electric drill.
Americans also buy things【C15】______they like to do things. Equipment【C16】______hobbies and books about "do-it-yourself' projects are very popular. Americans want to know how to cook with a "continental" flair while refinishing the bedroom furniture and【C17】______a million dollars in the stock market. The American【C18】______of activity is part of a generally【C19】______outlook on life, a belief that the value of knowledge is【C20】______to its usefulness.
【C1】
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