单选题Which of the following can be a disadvantage of U.S. "Big Steel" as pointed out in the text?

单选题A dog was ______ by a bus and killed.

单选题The United States was trying hard to smoke the enemy out of the holesin the target country．

单选题The bus broke down, so all the passengers were ______ to another bus.

单选题The economy in the United States is heavily dependent on aluminum, a material widely used in the construction of buildings and in making such diverse things as cars, airplanes, and food containers. In 1979 Americans used over five million tons of new aluminum, and one and a half million tons of recycled aluminum. Some ninety percent of the bauxite (矾土) ore from which new aluminum is normally derived had to be imported, to meet the demand. Poorer ores are abundant in the United States, however, and researchers at Purdue University may recently have found a way to obtain aluminum magnetically from these. Although aluminum is not attracted by ordinary magnets, under special conditions it becomes temporarily "paramagnetic", or very weakly responsive to a magnetic field. This is achieved by immersing ore particles in water to which certain salts have been added and then filtering the ore through steel wool in the presence of a strong magnetic field. It is hoped that this technique will reduce the amount of high-grade aluminum the United States must import.

单选题The company has the right to end his employment at any time.

单选题She asked the worker how long ______ to build the house. A. it had taken B. had it taken C. would it take D. it was taken

单选题Income inequality in the United State remained relatively stable for a period of nearly forty years. Beginning in the 1970's, however, this period of stability ended, as the first signs of widening income inequality became apparent. Over the course of the 1970's and 1980's , an increasingly clear trend toward greater income inequality emerged. By the end of the 1980's, the top 20 percent of workers were receiving the largest share of income ever recorded by government figures, and the bottom three fifths were receiving the lowest shares ever recorded. This trend has continued into the 1990's and currently shows no signs of decline. When the indicators of growing inequality were first observed in the 1970's, some researchers argued that the effects were merely temporary artifacts of short-term labor market disturbances. The new occupational structure appears to be one with an increase of well-paid technical, scientific and professional jobs at the top, a sliding middle class, and a growing poorly-paid service and retail jobs at the bottom. Several important labor-force changes appeared to be contributing to the shifting occupational structure. As occupational reconstructing and growing income inequality have become increasingly evident, a heated debate as to the causes and magnitude of these changes arose. Two dominant bodies of thought emerged around the issue: the job-skill mismatch thesis and the polarization thesis. Mismatch theorists argue that there is an increasing distance between the high skill requirements of post-industrial jobs and the inadequate training and mediocre qualifications of workers. They see the post-industrial economy leaving behind unskilled workers, especially women and minorities. For the mismatch theorist, the trend toward greater inequality is temporary arid will dissipate once the supply of workers acquires the skills demanded by a post-industrial economy. And they predict that the workers will experience an upgrading in their wages over the long run. Polarization theorists, on the other hand, believe that the rise in inequality is permanent, a result of the shift to a service-based economy. This vision of the postindustrial economy is characteristically polarized. The problem according to these theorists, is the type of jobs being generated in the new economy, not worker attributes. Because they believe the causes are structural and permanent, polarization theorists would deny the efficacy of public policies designed to educate and train unskilled workers. They predict a long-term continuation of the trend towards increasing income inequality. Studies show that the long-run increase in income inequality is also related to changes in the Nation's labor market and its household composition. The wage distribution has become considerably more unequal with more highly skilled, trained and educated workers at the top experiencing real wage gains and those at the bottom real wage losses. One factor is the shift in employment from those goods-producing industries that have disproportionately provided high-wage opportunities for low-skilled workers, towards services that disproportionately employ college graduates, and towards low-wage sectors such as retail trade. But within industry, shifts in labor demand away from less-educated workers are perhaps a more important explanation of eroding wages than the shift out of manufacturing. Also cited as putting downward pressure on the wages of less-educated workers are intensifying global competition and immigration, the decline of the proportion of workers belonging to unions, the decline in the real value of the minimum wage, the increasing need for computer skills, and the increasing use of temporary workers.

单选题 Attempts to restrict parking in the city centre have further aggravated the problem of traffic congestion.

单选题An explosion had thrown radioman Harley Olson out of bed. He worked wildly, trying to 26 an SOS. But the power was gone. Harley ran on deck. The crew was 27 into lifeboats. There was no room for him. He had no choice but to jump into the black water and start to swim. Suddenly, in the darkness, his fingers hit something hard. It was a life raft. Climbing 28 , Harley called out again and again. But no one answered. Soon his first feeling of 29 left him. In one way he was lucky. The raft had enough food and water for 15 men for several weeks. At daybreak, Harley saw some little boxes 30 by. He fished one out of the sea. Chewing gum. Quickly, he 31 in 20 small cartons. In the afternoon, Harley 32 another raft he tied it to his own. Later, a third raft bobbed up. And then a mattress floated by him in the wreckage. Harley could hardly believe his eyes. Here was the start of a bed room. He tugged the mattress aboard. Using boxes, he made himself a bed. With a blanket, he made a 33 from the hot sun, the next morning, he ate like a king. The sea was always peaceful. Every day was like a vacation. When the sun got hot, the carefree sailor took a swim, after that, he enjoyed a sunbath. Each evening, before going to bed, he went for a walk on the two rafts floating behind. Harley Otson was 34 with his Kingdom on the sea. The 35 trip lasted 28 days. A. pleasure B. hauled C. radio D. launch E. scrambling F. sight G. panic H. dimension I. aboard J. floating K. intensively L. spotted M. superior N. delighted O. shade

单选题My secretary usually opens my post__________ it’s marked“private”.

单选题A uniformed maid, whom Nicole estimated to be ______ the same age as herself, emerged from the house and crossed the porch to greet her warmly in Spanish.

单选题If we had finished our work a little earlier, we ______ to the museum.

单选题Many countries are increasing their use of natural gas, wind and other forms of ______.

单选题 Did your childs brain become smaller last summer?Probably not,according to a study byDr.Harris Cooper,professor at the University of Missouri-Columbia.The study found that when studentsreturn

单选题She leaned ______ the wall while she was speaking to her friend.A. toB. againstC. towardsD. for