题目内容
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A．ignorance of the technology
B．robust economic growth
C．the economic realities of its practicality
D．economic problems of hi-tech companies
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听力原文： There are many kinds of nerve cells, and this chapter deals mainly with three kinds. The sensory nerve cells carry messages of heat, light, sound and pressure from the skin, muscles and organs inside the body. Motor nerve cells carry messages to the muscles, and this causes the muscles to move. Connecting nerve cells go between the sensory nerve cells and motor nerve cells. After the messages go from the spinal cord to the brain, the brain sends messages through the motor nerve cells to the muscles. All these different nerve cells help us to see, hear, taste, smell and feel.
Now if you have no further questions about Chapter Seven, we'll go on to talk about the chemical processes involving the transfer of messages.
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A．One.
B．Two.
C．Three.
D．Four.
A．experience of the changes
B．admiration of the changes
C．analysis of the changes
D．hope for changes
B．Einstein was popular in America.
C．Einstein headed a research institute.
D．Einstein enjoyed reading about war.
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Antarctica has actually become a kind of space station—a unique observation post for detecting important changes in the world's environment. Remote from major sources of pollution and the complex geological and ecological systems that prevail elsewhere, Antarctica makes possible scientific measurements that are often sharper and easier to interpret than those made in other parts of the world.
Growing numbers of scientists therefore see Antarctica as a distant-early-warning sensor, where potentially dangerous global trends may be spotted before they show up to the north. One premising field of investigation is glaciology. Scholars from the United States, Switzerland, and France are pursuing seven separate but related projects that reflect their concern for the health of the West Antarctic Ice Sheet—a concern they believe the world at large should share.
The Transantarctic Mountain, some of them more than 14,000 feet high, divide the continent into two very different regions. The part of the continent to the "east" of the mountains is a high plateau covered by an ice sheet nearly two miles thick. "West" of the mountain, the half of the continent south of the Americas is also covered by an ice sheet, but there the ice rests on rock that is mostly well below sea level. If the West Antarctic lee Sheet disappeared, the western part of the continent would be reduced to a sparse cluster of island.
While ice and snow are obviously central to many environmental experiments, others focus on the mysterious "dry valley" of Antarctica, valleys that contain little ice or snow even in the depths of winter. Slashed through the mountains of southern Victoria land, these valleys once held enormous glaciers that descend 9,000 feet from the polar plateau to the Ross Sea. Now the glaciers are gone, perhaps a casualty of the global warming trend during the 10,000 years since the ice age. Even the snow that falls in the dry valleys is blasted out by vicious winds that roar down from the polar plateau to the sea. Left bare are spectacular gorges, rippled fields of sand dunes, clusters of boulders(大圆石) sculptured into fantastic shapes by 100-mile-an-hour winds, and an aura of extraterrestrial desolation.
Despite the unearthly aspect of the dry valleys, some scientists believe that they may carry a message of hope for the verdant(草木繁茂的)parts of the earth. Some scientists believe that in some cases the dry valleys may soak up pollutants faster than pollutants enter them.
Antarctica is scientifically important in that ______.
A．it is a space station
B．it is an ideal place for the investigation of glaciology
C．there is the mysterious dry valley
D．it can help people detect global environmental changes
A．such equipment has been set up for scientific purpose
B．the research groups there are like such kind of sensors
C．potential global changes can be seen on Antarctica first
D．Antarctica is remote from other parts of the earth
A person planning for a career today must look carefully at the expected occupational trends and changes in the job market. Affecting the economy are changes in the size, age, and distribution of the population, as well as developments in technology. These change& also affect employment opportunities. For example, an aging population has increased the need for medical care and other health services. Computer technology has not only eliminated or changed the nature of many jobs but also created new occupations. By analyzing the changing economy and the factors causing these changes, a person can forecast, or predict, future trends in employment.
A New Labor Force
The United States labor force the total number of people over the age of 16 who are employed or are actively seeking work totaled 127 million in 1992. By the year 2005, the labor force is expected to reach 151 million, an increase of 19%. This increase represents a slight slowdown in the growth of the labor force compared with growth during the previous 13-year period, 1979 to 1992. The slowdown is largely due to slower population growth in the United States.
The U.S. labor force will become more diverse by 2005. White non-Hispanic men will make up a slightly smaller proportion of the labor force than in 1992, while women and minority group members will make up a larger share. Between 1992 and 2006, blacks, Hispanics, Asians, and other ethnic(种族的) groups will account for roughly 36% of all people entering the work force. In addition, women will continue to join the labor force in growing numbers. In 1979, women made up 42% of the labor force. By 2006, their share is expected to be 48%.
The age makeup of the U.S. population will change from 1992 to 2005. There will be a smaller proportion of children and teenagers and a larger proportion of middle-aged and older people. The decline in the proportion of children and teenagers reflects the lower birth rates of the 1980s and 1990s. The large increase in the middle-aged population reflects the aging of the baby boom generation people born between 1946 and 1964. The rapid growth of the older population reflects both the high birth rates before the 1930s and improvements in medical technology that are allowing Americans to live longer.
The changing age make-up of the U.S. population will directly affect tomorrow's work force. Young people aged 16 to 24 are expected to make up roughly the same percentage of the labor force in 2005 as they did in 1992. However, the percentage of workers aged 25 to 34 will decline dramatically, from 28% to 21%. The baby boom generation will continue to add members to the work force, but their share will decline slightly. The most striking change will be a large increase in the percentage of workers between the ages of 46 and 54. These workers will account for 24% of the labor force in 2005, up from 18% in 1992. Workers in this age group usually have more employment experience than younger workers. Thus, employers will be able to choose from a larger pool of experienced applicants, people seeking jobs, in coming years.
Education: A Prerequisite(先决条件) for Employment
The education level of the labor force has risen dramatically in recent years. In 1980, for example, 19% of all workers aged 26 and older had completed four years of college. In 1992, 27% had a bachelor's degree or higher. The trend toward higher educational achievement is expected to continue.
From 1992 to 2005, employment growth will be faster for occupations requiring higher levels of education or training than for those requiring less. Managerial, professional, and technical positions will make up an increasing proportion of new jobs that become available. Many of the occupations projected for grow most rapidly are those with higher earnings.
Office and factory automation, changes in consumer demand
A．Y
B．N
C．NG
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