Part B 本部分內(nèi)容請(qǐng)參見(jiàn)211頁(yè)
Part C
Directions: Read the following text carefully and then translate the underlined segments into Chinese. Your translation should be written clearly on ANSWER SHEET 2. （10 points）
All U.S. nuclear weapons production facilities are presently closed down，and if the various agreements are adhered to， those facilities will never be required except for one critical capability. All modern nuclear weapons use uranium （鈾）， plutonium（钚）， and tritium（氚）. Uranium and plutonium have very long half-lives， and there is large surplus of these materials.
Tritium， however， has a relatively short half-life of about 12.6 years，so about 5 percent of the amount on hand must be replaced each year to maintain the current inventory. （46） Because of the large retirement of nuclear weapons by the United States in compliance with early agreements and national policy， tritium from retired weapons has been used to make up that lost through natural decay . （47） However，in about 10 to 15 years，depending on future negotiations，the United States will need a guaranteed supply of tritium to maintain its stockpile at whatever level is agreed on .
In anticipation of this future need to produce tritium，Defense Office Executive is pursuing two technologies. One uses a nuclear reactor that could also produce electricity whose sale would recover not only the capital cost of the reactor but also its annual operational cost. （48）Unfortunately，the present Administration has a definite bias against nuclear power， so an alternative method is also being pursued even though it is agreed that it will cost twice as much as a reactor and use as much electricity as a reactor would produce . This technology uses an accelerator to produce high-energy protons that in turn produce neutrons.
The main argument for the accelerator is that it produces no conventional nuclear wastes. （49）Proponents readily admit that it will produce radioactive materials， but with a relatively short half-life compared with that of wastes from spent nuclear fuel . The fact that the accelerator will require the equivalent of a nuclear power plant to supply its electricity is ignored.
（50）Proponents also neglect to mention that about 22 percent of all electrical energy generated in the United States comes from nuclear power plants，so that 22 percent of the power used by the accelerator will generate conventional nuclear wastes，in addition to those the accelerator produces . There is an alternative to either the reactor or the accelerator， which is simply to buy the required tritium from Canada or Russia.
Section Ⅲ Writing
Part A
51. Direction:
Yesterday you learnt in a newspaper ad that there is a job vacancy in a foreign-owned company. A secretary for the manager is needed. Write a letter to its personnel department，and
1） show your desire for the position，
2） present your qualifications，
3） and express your wish for an job interview.
Part B
52. Direction:
A. Study the following account of a personal experience carefully and write an essay in no less than 200 words.
B. Your essay must be written clearly on ANSWER SHEET 2.
C. Your essay should meet the requirements below:
1） Elaborate your impressions on the story told.
2） And point out its implications in our life.
You should write about 200 words neatly on ANSWER SHEET 2. （20 points）
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One summer my wife Chris and I were invited by friends to row down the Colorado River in a boat. Our expedition included many highly successful people—the kind who have staffs to take care of life's daily work. But in the wilder rapids， all of us naturally set aside any pretenses and put out backs into every stroke to keep the boat from tumbling over. At each night's encampment， we all hauled supplies and cleaned dishes. After only two days in the river， people accustomed to being spoiled and indulged had become a team， working together to cope with the unpredictable twists and turns of the river. I believe that in life—as well as on boat trips—teamwork will make all our journeys successful ones. The rhythms of teamwork have been the rhythms of my life.... |
