gre阅读练习每日一篇(三十一)

　　掌握了gre阅读里的长难句，到了实战演习的时候了。gre阅读练习每日一篇帮助gre考生循序渐进地进行练习和总结。希望gre考生在进行gre阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。

　　Our visual perception depends on the reception of energy reflecting or radiating from that which we wish to perceive. If our eyes could receive and measure infinitely delicate sense-data, we could perceive the world with infinite precision. The natural limits of our eyes have, of course, been extended by mechanical instruments; telescopes and microscopes, for example, expand our capabilities greatly. There is, however, an ultimate limit beyond which no instrument can take us; this limit is imposed by our inability to receive sense-data smaller than those conveyed by an individual quantum of energy. Since these quanta are believed to be indivisible packages of energy and so cannot be further refined, we reach a point beyond which further resolution of the world is not possible. It is like a drawing a child might make by sticking indivisible discs of color onto a canvas.

　　We might think that we could avoid this limitation by using quanta with extremely long wavelengths; such quanta would be sufficiently sensitive to convey extremely delicate sense-data. And these quanta would be useful, as long as we only wanted to measure energy, but a completely accurate perception of the world will depend also on the exact measurement of the lengths and positions of what we wish to perceive. For this, quanta of extremely long wavelengths are useless. To measure a length accurately to within a millionth of an inch, we must have a measure graduated in millionths of an inch; a yardstick graduated in inches in useless. Quanta with a wavelength of one inch would be, in a sense, measures that are graduated in inches. Quanta of extremely long wavelength are useless in measuring anything except extremely large dimensions.

　　Despite these difficulties, quanta have important theoretical implications for physics. It used to be supposed that, in the observation of nature, the universe could be divided into two distinct parts, a perceiving subject and a perceived object. In physics, subject and object were supposed to be entirely distinct, so that a description of any part of the universe would be independent of the observer. The quantum theory , however, suggests otherwise, for every observation involves the passage of a complete quantum from the object to the subject, and it now appears that this passage constitutes an important coupling between observer and observed. We can no longer make a sharp division between the two in an effort to observe nature objectively. Such an attempt at objectivity would distort the crucial interrelatioship of observer and observed as parts of a single whole. But, even for scientists, it is only in the world of atoms that this new development makes any appreciable difference in the explanation of observations.

　　17. The primary purpose of the passage is to

　　 discuss a problem that hinders precise perception of the world

　　 point out the inadequacies of accepted units of measurement

　　 criticize attempts to distinguish between perceiving subjects and perceived objects

　　 compare and contrast rival scientific hypotheses about how the world should be measured and observed

　　 suggest the limited function of sensory observation

　　18. According to the passage, quanta with an extremely long wavelength cannot be used to give complete information about the physical world because they

　　 exist independently of sense-data

　　 are graduated only in inches

　　 have an insignificant amount of energy

　　 cannot, with present-day instruments, be isolated from quanta of shorter wavelength

　　 provide an insufficiently precise means of measuring length and position

　　19. Which of the following describes a situation most analogous to the situation discussed in lines 9-13?

　　 A mathematician can only solve problems the solution of which can be deduced from known axiom.

　　 An animal can respond to no command that is more complicated syntactically than any it has previously received.

　　 A viewer who has not learned, at least intuitively, the conventions of painting, cannot understand perspective in a drawing.

　　 A sensitized film will record no detail on a scale that is smaller than the grain of the film.

　　 A shadow cast on a screen by an opaque object will have sharp edge only if the light source is small or very distant.

　　20. The author uses the analogy of the childs drawing primarily in order to

　　 illustrate the ultimate limitation in the precision of sense-data conveyed by quanta

　　 show the sense of helplessness scientists feel in the face of significant observational problems

　　 anticipate the objections of the those scientists who believe that no instrumental aid to observation is entirely reliable

　　 exemplify the similarities between packages of energy and varieties of color

　　 disparage those scientists who believe that measurement by means of quanta offers an accurate picture of the world

　　21. The author implies that making a sharp division between subject and object in physics is

　　 possible in a measurement o objects length and position, but not in a measurement of its energy

　　 still theoretically possible in the small-scale world of atoms and electrons

　　 possible in the case of observations involving the passage of a complete quantum

　　 no longer an entirely accurate way to describe observation of the universe

　　 a goal at which scientists still aim

　　22. The authors use of the phrase in a sense implies which of the following?

　　 Quanta of extremely long wavelength are essentially graduated in inches.

　　 quanta of one-inch wavelength are not precisely analogous to yardsticks graduated in inches.

　　 Quanta of extremely long wavelength, in at least on e respect, resemble quanta of shorter wavelength.

　　 quanta of on-inch wavelength and quanta of extremely long wavelength do not differ only in their wavelengths.

　　 quanta of one-inch wavelength must be measured by different standards than quanta of extremely long wavelength.

　　23. According to the passage, the quantum theory can be distinguished from previous theories of physics by its

　　 insistence on scrupulously precise mathematical formulations

　　 understanding of the inherent interrelationship of perceiver and perceived

　　 recognition of the need for sophisticated instruments of measurement

　　 emphasis on small-scale rather than on large-scale phenomena

　　 regard for philosophical issues as well as for strictly scientific ones

　　Tillie Olsens fiction and essays have been widely and rightly acknowledged as major contributions to American literature. Her work has been particularly valued by contemporary feminists. Yet few of Olsens readers realize the extent to which her vision and choice of subject are rooted in an earlier literary heritagethe tradition of radical political thought, mostly socialist and anarchist, of the 1910s and 1920s, and the Old Left tradition of the 1930s. I do not mean that one can adequately explain the eloquence of her work in terms of its political origins, or that left-wing politics were the single most important influence on it. My point is that its central consciousnessits profound understanding of class and gender as shaping influences on peoples livesowes much to that earlier literary heritage, a heritage that, in general, has not been sufficiently valued by most contemporary literary critics.

　　24. The primary purpose of the passage is to

　　 argue that Olsens understanding of class and gender is her greatest gift as a writer

　　 acknowledge Olsens importance as the leading spokesperson for a radical literary heritage

　　 point out a literary heritage to which Olsens work is related

　　 urge literary critics to investigate the origins of a literary heritage

　　 suggest that Olsens work has been placed in a literary heritage to which it does not belong

　　25. According to the author, which of the following is true of the heritage mentioned in the passage?

　　 It emphasizes gender as the determinate influence on peoples lives.

　　 It has been the most important influence on Olsens work.

　　 It includes political traditions that span three decades of the twentieth century.

　　 It explains the eloquence but not the subject matter of Olsens work.

　　 It reflects primarily the development of socialist political thought in the early twentieth century.

　　26. In the sentence I do not influence on it , the author dos which of the following?

　　 Broadens an existing classification.

　　 Contradicts the passages central thesis.

　　 Qualifies a commonly accepted point of view.

　　 Presents conflicting explanations for a phenomenon.

　　 Denies possible interpretations of an earlier assertion.

　　27. According to the author, Olsens work has been

　　 rightly acknowledged for its contribution to political thought

　　 thought to represent the beginning of new literary tradition

　　 a needed impetus for social change

　　 most clearly influenced by feminism

　　 deservedly admired by readers

答案：17-27：AEDADBBCCEE