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国民经济分析采用影子价格体系是因为要考虑项目的外部效果和无形效果。 ()
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Nature' s Gigantic Snowplough
On January 10, 1962, an enormous piece of glacier broke away and tumbled down the side of a mountain in Peru. A mere seven minutes later, when cascading ice finally came to a stop ten miles down the mountain, it had taken the lives of 4,000 people.
This disaster is one of the most devastating examples of a very common event: an avalanche of snow or ice. Because it is extremely cold at very high altitudes, snow rarely melts. It just keeps piling up higher and higher. Glaciers are eventually created when the weight of the snow is so great that the lower layers are pressed into solid ice. But most avalanches occur long before this happens. As snow accumulates on a steep slope, it reaches a critical point at which the slightest vibration will send it sliding into the valley below.
Even an avalanche of light power can be dangerous, but the Peruvian catastrophe was particularly terrible because it was caused by a heavy layer of ice. It is estimated that the ice that broke off weighed three million tons. As it crashed down the steep mountainside like a gigantic snowplough, it swept up trees, boulders and tons of topsoil, and completely crushed and destroyed the six villages that lay in its path.
At present there is no way to predict or avoid such enormous avalanches, but, luckily, they are very rare. Scientists are constantly studying the smaller, more common avalanches, to try to understand what causes them. In the future, perhaps dangerous masses of snow and ice can be found and removed before they take human lives.
The first paragraph catches the reader's attention with a______.
My mother was named Harriet Bailey. She was the daughter of Issac and Betsey Bailey, both coloured, and quite dark. My mother was of a darker complexion than either my grandmother or grandfather.
My father was a white man. He was admitted to be such by all I ever heard speak of my parentage. The opinion was also whispered that my master was my father; but of the correctness of this opinion, I know nothing; the means of knowing was withheld from me. My mother and I were separated when I was but an infant — before I knew her as my mother. It is a common custom, in the part of Maryland from which I ran away, to part children from their mothers at a very early age. Frequently, before the child has reached its twelfth month, its mother is taken from it, and hired out on some farm a considerable distance off, and the child is placed under the care of an older woman, too old for field labour. For what this separation is done, I do not know, unless it be to hinder the development of the child's affection towards its mother.
The author did not know exactly when he was born because______.
38 Morgan Road,
Harbury,
Lincolnshire.
The Administrative Officer,
Swiss Medico Ltd,
PO Box 1263, Zurich, Switzerland. 17 March 199__
Dear Sir,
I am writing to respond to your advertisement in the "Daily Globe".
I am at present employed as a translator in a medical research organization and also act as interpreter there. I joined this organization two years ago.
I am 31 and single. I read French and German at Howland College, Cambridge and stayed here to take my Ph. D in the dialects of North-East France.
I should be interested in working for your company for two reasons: firstly, I should like to live abroad and secondly, the work would involve medical/scientific translation which is my particular field.
I shall look forward to hearing from you.
Yours sincerely,
Rupert Johnson
The main purpose of the letter is to______.
SAVER
The Saver return is our most flexible leisure ticket. It can be used on all trains on Saturdays, Sundays and public holidays. On Mondays and Fridays it can be used on most trains except some peak trains.
CONDITIONS OF TRAVEL
— You must book your ticket at least seven full days before you start your journey.
— You must return within thirty-one days.
— Break of journey is not allowed.
— There are no reductions on Saver return tickets for children under the age of sixteen.
— Saver return tickets are only available for journeys over fifty miles.
The Saver return ticket is NOT valid for______.
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