[单项选择]Concrete is probably used more widely than any other substance except water, yet it remains largely unappreciated. "Some people view the 20th century as the atomic age, the space age, the computer age—but an argument can be made that it was the concrete age," says cement specialist Hendrik van Oss. "It’s a miracle material. " Indeed, more than a ton of concrete is produced each year for every man, woman and child on Earth. Yet concrete is generally ignored outside the engineering world, a victim of its own ubiquity and the industry’s conservative pace of development. Now, thanks to environmental pressures and entrepreneurial innovation, a new generation of concretes is emerging. This high-tech assortment of concrete confections promises to be stronger, lighter, and more environmentally friendly than ever before.
The concretes they will replace are, for the most part, strong and durable, but with limitations. Concrete is sound under compression but weak under tension. Steel rebar
A. the traditional building material concrete is the only man-made miracle
B. concrete is indispensable in the development of modern construction industry
C. compared with other inventions, concrete is more practical and useful
D. concrete, as a building material, can be mixed with any other materials

[单项选择]Concrete is probably used more widely than any other substance except water, yet it remains largely unappreciated. "Some people view the 20th century as the atomic age, the space age, the computer age—but an argument can be made that it was the concrete age," says cement specialist Hendrik van Oss. "It’s a miracle material. " Indeed, more than a ton of concrete is produced each year for every man, woman and child on Earth. Yet concrete is generally ignored outside the engineering world, a victim of its own ubiquity and the industry’s conservative pace of development. Now, thanks to environmental pressures and entrepreneurial innovation, a new generation of concretes is emerging. This high-tech assortment of concrete confections promises to be stronger, lighter, and more environmentally friendly than ever before.
The concretes they will replace are, for the most part, strong and durable, but with limitations. Concrete is sound under compression but weak under tension. Steel rebar
A. Concrete suffers from its own unique features as well as the slow development of building industry.
B. Concrete is not appreciated because of its dull color, its drawbacks, with little improvement as a building material.
C. Slow progress of building industry does harm to the application and popularity of concrete.
D. Concrete is ignored because it is too common with little advance in its technology.

[单项选择]Passage 1 Britain almost more than any other country in the world must seriously face the problem of building upwards，that is to say of accommodating a considerable proportion of its population in high blocks of flats．It is said that the Englishman objects to this type of existence，but if the case is such, he does in fact differ from the inhabitants of most countries of the world today．In the past our own blocks of flats have been associated with the lower-income groups and they have lacked the obvious provisions，such as central heating，constant hot water supply, electrically operated lifts from top to bottom，as well as such details，important notwithstanding(然而)，as easy facilities for disposal of dust and rubbish and storage places for baby carriages on the ground floor, playgrounds for children on the top of the buildings，and drying grounds for washing．It is likely that the dispute regarding flats versus(对抗)individual houses will continue to rage on for a long time as far as Brit
A. English people，like most people in other countries，dislike living in flats
B. people in most countries of the world today are not opposed to living in flats
C. people in Britain are forced to move into high blocks of flats
D. modern flats still fail to provide the necessary facilities for living

[单项选择]Text 4