As every ancient mariner knew, traveling by sail is a simple way to go. Though the winds could be fickle and the boats pokey, the energy source that moved the ship was free, plentiful and renewable. Now the same technology that conquered the oceans of Earth may conquer the ocean of space.
This week a Russian and American consortium will announce plans for an April launch of the first so-called solar-sail vehicle, a multicasted spacecraft that will use sunlight to push itself along. To a public raised on smoke-and-tire rocketry, the idea of drawing energy straight from space seems fanciful. To the people behind the new ship, however, the technology is not only sensible but inevitable, the easiest way to reinvent the business of cosmic travel. "This allows us to use very little fuel to fly very great distances," says Bud Schurmeier, a former NASA engineer and an adviser to the project. "It’s an in triguing concept."
The idea behind solar sa
A. Patent.
B. Invention.
C. Hope.
D. Pride.
As every ancient mariner knew, traveling by sail is a simple way to go. Though the winds could be fickle and the boats pokey, the energy source that moved the ship was free, plentiful and renewable. Now the same technology that conquered the oceans of Earth may conquer the ocean of space.
This week a Russian and American consortium will announce plans for an April launch of the first so-called solar-sail vehicle, a multicasted spacecraft that will use sunlight to push itself along. To a public raised on smoke-and-tire rocketry, the idea of drawing energy straight from space seems fanciful. To the people behind the new ship, however, the technology is not only sensible but inevitable, the easiest way to reinvent the business of cosmic travel. "This allows us to use very little fuel to fly very great distances," says Bud Schurmeier, a former NASA engineer and an adviser to the project. "It’s an in triguing concept."
The idea behind solar sa
A. Sunlight.
B. Nuclear.
C. Wind.
D. Electricity.
| Three friends decided to sail around
the world in a small yacht(游艇). They loaded it with food and water and set off.
They traveled to many beautiful places, and were having a wonderful
time. Until one day, when they had been at sea for about a month, a fierce storm blew up. Great waves crashed(坠毁)down on their little yacht. The mast(船桅) broke and the yacht was soon thrown against some rocks near a deserted island. The three men were able to struggle to the island, taking with them as much food as they could carry. Not a tree, not a bush, not a flower grew on the island. There was not an animal of any kind, not even a bird or an insect. For a few weeks the three men were able to live on the food they had saved, but at last it was gone--except for one piece of bread. They decided that whoever had the best dream the next night could h A. many souvenirs(纪念品) with them B. no medical supplies with them C. a large crew with them D. many provisions(食物贮备) with them [单项选择]Every profession or trade, every art, and every science has its technical vocabulary. Different occupations, however, differ widely in the character of their special vocabularies. In trades and handicrafts, and other vocations, like farming and fishery, that have occupied great numbers of men from remote times, the technical vocabulary, is very old. It consists largely of native words, or of borrowed words that have worked themselves into the very fibre of our language. Hence, though highly technical in many particulars, these vocabularies are more familiar in sound, and more generally understood, than most other technicalities. The special dialects of law, medicine, divinity, and philosophy have also, in their older strata, become pretty familiar to cultivated persons and have contributed much to the popular vocabulary. Yet every vocation still possesses a large body of technical terms that remain essentially foreign, even to educated speech. And the proportion has been much increased
A. a linguist B. an essayist C. a scientist D. an attorney 我来回答: 提交
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