In many areas the A380 has proven technologies that will become the standard for the next generation of airliners. As one example, the aircraft benefits from a higher proportion of carbon-fibre composite than any previous Airbus aircraft, around 22% compared with 12% for an A340-600 or 9% on a 777. For the first time, this technology has been applied to major components such as the centre-wing box. The information and data management requirements for an aircraft as large as the A380 also have placed demands on system design. These have been met in two ways. The aircraft's system uses 22 computers of 7 different varieties that share all the functions traditionally handled by individual " black boxes" Data exchange in the system utilizes a high capacity and high speed datalink with data exchange at a rate of 10 million bits per second, 100 times the capacity of a traditional avionics system.

AI

核潜艇

可再生能源发电装机容量

MLA

阅读理解Rumor has it that more than 20 books on creationism/evolution are in the publisher's pipelines. A few have already appeared. The goal of all will be to try to explain to a confused and often unenlightened citizenry that there are not two equally valid scientific theories for the origin and evolution of universe and life. Cosmology, geology and biology have provided a consistent, unified, and constantly improving account of what happened. "Scientific" creationism, which is being pushed by some for "equal time" in the classrooms whenever the scientific accounts of evolution are given, is based on religion, not science. Virtually all scientists and the majority of nonfundamentalist religious leaders have come to regard "scientific" creationism as bad science and bad religion. 　　The first four chapters of Kitcher' s book give a very brief introduction to evolution. At appropriate places, he introduces the criticisms of the creationists and provides answers. In the last three chapters, he takes off his gloves and gives the creationists a good beating. He describes their programmes and tactics, and, for those unfamiliar with the ways of creationists, the extent of their deception and distortion may come as an unpleasant surprise. When their basic motivation is religious, one might have expected more Christian behavior. 　　Kitcher is a philosopher, and this may account, in part, for the charity and effectiveness of his arguments. The　nonspecialist will be able to obtain at least a notion of the sorts of data and argument that support evolutionary theory. The final chapters on the creationists will be extremely clear to all. On the dust jacket of this fine book, Stephen Jay Gould says:" This book stands for reason itself." And so it does―and all would be well were reason the only judge in the creationism/evolution debate.

单选题Inviting, suggesting, warning, ordering are instances of commissives.

单选题He was very distraught. Later on, once he composed himself, he agreed to meet with detectives.

单选题Abruptly the ground fell away from our feet, and an ______ void opened before us.

单选题Women are quite competent drivers, but they are very seldom consistently first-class. At best they are a mild hazard, at worst potentially lethal. A wise male driver will always give them plenty of road and still be on the look-out for the unpredictable to happen. This deficiency has nothing to do with their lack of ability to cope with the mechanical complexities of the vehicle; it is due to an inherent characteristic which, in certain other circumstances, may be highly desirable, but which, behind the wheel, is deadly. It is their lust for talking. Women together in a car succumb to this need and when they talk they look into each other's faces. Simple words are insufficient. It is necessary for them to see the expression which partners words and so read the meaning the words leave unsaid. When talking instead of listening, they look to estimate the reaction their words have had. Thus two women in the front of a car repeatedly distract each other's attention from the road and four represent an incredible danger because the one nominally driving the car feels it necessary not only to see and hear what her companion is talking about but also, such is her nature, what those in her back are discussing in case it is anything into which she can inject an added opinion, or in the hope of collecting fresh fuel to feed other fires on later occasions. Quite apart from this factor, which means that the road ahead is quite often an unknown quantity, women seldom use the driving mirror except for cosmetic purposes, after which its position gives the driver little indication of the state of the road behind. A final important factor that seems to lie at the back of feminine attitudes to driving is that comparatively few women have the feel for a machine that so many men have; the satisfaction of a slick change-down means nothing to them. The co-ordination between the various maneuvers, an operation which gives many men a boost of pride, is only a momentary lapse in their concentration on the topic in hand.

单选题By the time I get to the office 10 minutes later, I"ve already risked being hit by a car several times. Italy and China are very similar in this respect. Traffic lights have more of an ornamental function than a practical one.

单选题The spring will continue to bounce. It will bounce at its natural frequency. It will do this until all of the energy is used up. This is energy that was originally put into it.

单选题I______yesterday, but I was suspended by an unexpected visit.

单选题Beneath its myriad rules, the fundamental purpose of ______ is to make the world a more pleasant place to live in, and you a more pleasant person to live with.

单选题The connective implication corresponds to the English ______.

单选题" Essay end up in books, " —like this one—" but they start their lives in magazines, " wrote Susan Sontag in her introduction to The Best American Essays 1992. That"s what I see first, year and year; the magazines. Hundreds of them. Some so slick they slip from my hands and slide off each other when I try to construct neat piles. Some of the satiny and scented fashion magazines display so much commercialized fetishism—high-gloss models brought to erotic ecstasy by luxurious handbags—that I feel, as I dutifully flip through the clingy pages searching for content, I must be a creature from a different planet, a terribly deprived and disadvantaged one. Still, that doesn"t prevent me from sniffing the perfume ads along the way, and for an intoxicating moment sample a world where reading and writing essays seems not just a marginal occupation, but decidedly declasse. The Best American Essays features a selection of the year"s outstanding essays, essays of literary achievement that show an awareness of craft and forcefulness of thought. Hundreds of essays are gathered annually from a wide assortment of national and regional publications. These essays are then screened, and approximately one hundred are turned over to a distinguished guest editor, who may add a few personal discoveries and who makes the final selections. The list of Notable Essays appearing in the back of the book is drawn from the final comprehensive list that includes not only all the essays submitted to the guest editor but also many that were not submitted. To qualify for the volume, the essay must be a work of respectable literary quality, intended as a fully developed, independent essay on a subject of general interest(not specialized scholarship), originally written in English(or translated by the author)for publication in an American periodical during the calendar year. Today"s essay is a highly flexible and shifting form, however, so these criteria are not carved in stone. Magazine editors who want to be sure their contributions will be considered each year should submit issues or subscriptions to: Robert Atwan, Series Editor, The Best American Essays. P. 0. Box 220, Redville, MA 02137. Writers and editors are welcome to submit published essays from any American periodical for consideration; unpublished work does not qualify for the series and cannot be reviewed or evaluated. Please note: all submissions must be directly from the publication and not in manuscript or printout format. Editors of online magazines and literary bloggers should not assume that appropriate work will be seen; they are invited to submit printed copies of the essays(with full citations)to the address above.

单选题There used to be an old city here, which was______under the river about 2,000 years ago.

单选题We think it is wrong to single out any______of society for Aids testing.

单选题______divides the 19th century into the age of Romanticism and Realism in American literature.

单选题All languages have some differences in verb forms which are used to produce cohesion.（南开大学2005研)