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Renaissance involved a rebirth of letters and arts stimulated by the recovery of texts
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更多“Renaissance involved a rebirth…”相关的问题
The article can be best titled as ______.
A．Education in the Renaissance
B．Humanism in the Renaissance
C．Debate on Education
D．The New Education
A．It is full of renaissance favor.
B．It is a star in a famous movie.
C．It is one of the tourist hot spots.
D．It is a symbol of London.
A.The musical Renaissance was defined by technique rather than style.
B.The musical Renaissance was too short to give rise to a new musical style.
C.Renaissance musicians adopted the styles of both Greek and Roman musicians.
D.During the Renaissance, music never remained the same for very long.
The commerce ______.
A．was an important element in building the Renaissance culture
B．kept the people in cities alive with food and clothes
C．brought about the exchange of ideas
D．was always prosperous between city states
Humanism during the Renaissance ______.
A．was not different from other intellectual movements
B．applied new educational methods in training clergies
C．brought about great changes in the studying of Bible
D．focused upon the study between man and society
A.The Renaissance
B.When different varieties of English have emerged
C.Norman Conquest
D.Viking Invasions
A.It flourished in France
B.It was a furtherance of the Renaissance
C.Its purpose was to enlighten the whole world
D.It emphasized "reason & order"
A.The natural and unrestrained style
B.The slender waist
C.The square-necked bodices
D.The stiff and tall collar
A.Philip Sidney
B.Edmund Spenser
C.William Shakespeare
D.Christopher Marlowe
Rocket Renaissance
The Ear of Private Spaceflight Is About to Start
Background
Two years ago, people witnessed the first space travel by SpaceShip One. Three people were involved in this flight: Burt Rutan, who designed the craft, and Mike Melvill, who flew it--although they were ably assisted by Paul Allen, one of the founders of Microsoft, who paid for it. Certainly, people have long been known that manned spaceflight was possible. What they showed was that it is not just a game for governments. Private individuals can play, too.
People involved
Now, lots of people want to join in, and most of them have just met up at the International Space Development Conference in Los Angeles, to engage in that mixture of camaraderie and competition that characterises the beginnings of a new technology. And, as might be expected, they have two of the necessary ingredients of success: ideas and money.
First, the money. So far, more than $1 billion is known to have been committed to building private spaceships and the infrastructure to support them. For example, Mr.. Rum' s follow-up vehicle, SpaceShip Two, is expected to cost its backers, Virgin Galactic, $240m for a fleet of five. The spaceport in New Mexico from which these are intended to fly will account for another $225m, although New Mexico's government is planning to raise this money itself.
These are not small sums, of course. On the other hand, Virgin Galactic has already banked $14m of deposits towards the $200,000 fare from people who want to travel on SpaceShip Two, even though it has yet to be built, let alone flown.
All this suggests that spaceflight, if not exactly entering the age of the common man, is at least entering the age of the moderately prosperous enthusiast. For entrepreneurs, it is no longer necessary to have billions of dollars to get into space; millions will now do. And for those who merely wish to travel there, and have enough money in their bank account, reality is favourable.
Get started
As with aircraft a century ago, a lot of designs are competing with each other, and there is no certainty about which will succeed. The initial goal is to build a "suborbital" vehicle. This will not have to develop the tremendous speed needed to go into orbit around the Earth. instead, it will travel briefly into space, offering a short thrilling ride out of the atmosphere, a few minutes of weightlessness, and a spectacular view of the planet from about 100kin. Four important criteria are how you take off, what fuel you use, what your craft is made of, and how you come back.
Most people's vision of a rocket launch is straight up from the ground. But, of the five vehicles most likely to be developed, two will actually be launched from the air. SpaceShip Two will be carded to high altitude by a purpose-built aircraft known as Eve before its rocket motor is ignited. And Explorer, a vehicle being designed by Space Adventures, will be launched from the top of a high-altitude Russian research plane called the M-55X, according to Eric Anderson, the firm's president and chief executive.
As Dennis Jenkins, a consultant engineer at NASA, America's space agency, points out, this is similar to using a two-stage rocket to get into space, with the aircraft acting as the first stage. However, a plane offers several advantages over a throw-away booster rocket. First, it can be used again. Second, it uses oxygen from the air, rather than having to carry its own oxidant, which saves weight. Third, it is lifted by wings. That means the atmosphere is an advantage, rather than a hindrance. All this means that the spacecraft itself can be lighter and cheaper.
Not everyone wants to run two vehicles, though. Jeff Greason, president of XCOR Aerospace, a firm based in Mojave, California, is developing a two-person, ground-launched suborbital rocketplane c
A．Y
B．N
C．NG
A.71%
B.81%
C.85%
D.91%
