编辑点评： GRE的写作部分是不少考生头疼的部分，不仅考察考生的英语能力更是考察学生的逻辑与思维能力。多阅读优质范文无疑对GRE写作有很大的帮助。本系列为大家挑选了ISSUE部分的优质范文。

　　Most people would agree that buildings represent a valuable record of any society s past, but controversy arises when old buildings stand on the ground that modern planners feel could be better used for modern purpose. In such situation, modern development should be given precedence over the preservation of historic buildings so that comtemporary needs can be served;

　　The speaker asserts that wherever a practical, utilitarian need for new buildings arises this need should take precedence over our conflictiong interest in preserving historic buildings as a record of our past. In my view, however, which interest should take precedence should be determined on a cast-by-cast basis-and should account not only for practical and historic consideration but also aethetic ones.

　　In determing whether to raze an older building, planners should of course consider tht community s current and anticipated utilitarain needs. For example, if an additional hospital is needed to adequately serve the health-care needs of a fast-growing community, this compelling interest might very well outweigh any interest in preserving a historic building that sits on the proposed site. Or if additional parking is needed to ensure the economic servival of a city s downtown district, this interest might take precedence over the historic value of an old structure that stands in the way of a parking structure. On the other hand, if the need is mainly for more office space, in some cases an architecturally appropriate add-on or annex to an older building might serve just as well as razing the old building to make way for a new one. Of course, an expensive retrofit might not be worthwhile if no amount of retrofitting would meet the need.

　　A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun’s very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is librated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms.

　　The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of year. (more information of GRE：manfen.net)

　　The nuclear energy is released at the Sun’s center as high-energy gamma radiation, a form ofelectromagnetic radiation like light and radio waves, only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun to be reemitted at slightly longer wavelengths.

　　This radiation, in its turn is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small fraction of the Sun’s light and heat is emitted in such directions that after passing unhindered through interplanetary space, it hits the Earth.