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Walk a Quarter-Mile or Die If you can walk a quarter-mile, odds (可能性) are you have at least six years of life left in you, scientists say. And the faster you can (1) it, the longer you might live. While walking is no guarantee of (2) or longevity (长寿), a new study found that the ability of elderly people to do the quarter-mile was an "important determinant (决定因素)" in whether or not they’d be (3) six years later and how much illness and disability they would endure. "The (4) to complete this walk was a powerful predictor of health outcomes," said study leader Anne Newman of the University of Pittsburgh School of Medicine. "In fact, we (5) that the people who could not complete the walk were (6) an extremely high risk of later disability and death. " Newman and colleagues recruited nearly 2,700 white and African-American men and women aged 70 to 79 to (7) the walk. All the participants were screened and determined to be in relatively (8) health, and they had all said they had previously walked that far with no (9) . Only 86 percent of them finished, (10) . The scientists then monitored the health and mortality of all (11) for the next six years. "There was a big gap in health outcomes (12) people who could complete the longer walk and people who could not, with the latter being at an extremely high (13) of becoming disabled or dying," Newman said. "What was really surprising is that these people were not (14) of how weak they actually were. " Finishing times were found to be crucial, too. Those who completed the walk but were among the slowest 25 percent (15) three times greater risk of death than the speedier folks.
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Dark Forces Dominate Universe The earth, moon, sun and all visible stars in the sky make up less than one percent of the universe. Almost all the rest is dark matter and dark energy, unknown forces that (1) astronomers. Observations in recent years have changed the basic (2) of how the universe evolved and have indicated how little is known about the major forces and substances that (3) our world. A．understanding B．value C．pattern D．structure
High-Tech Warfare (战争) Today, high-tech warfare is no longer an abstract concept, but a real issue. Technology (1) tactics, sociology, and the development of weaponry (武器). It also causes the changes in battles. Then what are the new characteristics of modern battles (2) by the application of high technologies High-tech warfare naturally includes high technology. In modern battles, a single kind of weapon can hardly be (3) . Various weaponry, such as intelligence detection and information processing, should (4) well with each other. Aerial (航空的) weaponry becomes the main force in battles in the sky. Precision homing (精确制导) weaponry like cruise missiles and missiles (5) satellite homing systems becomes the main attack weapons. Battle control systems play a dominant role. Various weapons and logistics (后勤) systems are (6) into a comprehensive framework, centrally representing the modern high-tech weaponry. Depending on various (7) equipment and means in electronic warfare, our army will not be passively beaten. (8) the battlefield, high-tech warfare has created a type of non-linear (非线性的) chaos. Because of the use of long-range precision weaponry, the opposite parties in warfare can’t "touch" or "see" each other, and distance is no longer the decisive factor affecting the (9) of battles. It is hard to clearly define the lines between the frontier and the rear, as well as attack and defense. The traditional three-dimensional air-sea battlefield will be (10) by the multi-dimensional battlefield composed of air, sea, magnetic, electrical and information battlefields. No large-scale movements can be conducted (11) . Because modern weaponry systems are closely related to chains of demand and communication and electronic technology, the parties (12) have to pay attention to the usufruct (使用权) and control of electromagnetic frequency spectrum. So electronic warfare becomes (13) important and the necessary guarantee of victory. Whatever (14) warfare goes to and whatever cloak (宽大外衣) it wears, it always violates peace and brings the world bloodshed (流血). Most people think of high technology as a (15) to enhance their lives, and they don’t wish it to be used to destroy lives.
Dark Forces Dominate Universe The earth, moon, sun and all visible stars in the sky make up less than one percent of the universe. Almost all the rest is dark matter and dark energy, unknown forces that (1) astronomers. Observations in recent years have changed the basic (2) of how the universe evolved and have indicated how little is known about the major forces and substances that (3) our world. A．worry B．move C．puzzle D．reject
Unpopular Subjects Is there a place in today’s society for the study of useless subjects in our universities Just over 100 years ago Fitzgerald argued in a well-written letter (1) Nature that "Universities must be allowed to study useless subjects— (2) they don’t, who will" He went on to use the (3) of Maxwell’s electrodynamics (电动力学) as one case where a "useless subject" has been transformed to a useful subject. Nowadays this argument is again very much (4) in many universities. Indeed one suspects that it is one of those arguments that must be (5) anew (重新) by each generation. But now there is an added twist (歪曲)—subjects must not only be useful, they must also be (6) enough that students will flock (蜂拥) to do them, and even flock to pay to do them. A．fix B．modify C．review D．develop
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