GRE之OG2阅读真题精选整合.doc
《GRE之OG2阅读真题精选整合.doc》由会员分享,可在线阅读,更多相关《GRE之OG2阅读真题精选整合.doc(14页珍藏版)》请在三一办公上搜索。
1、GRE之OG2阅读真题精选整合 在备考GRE阅读的过程中,练真题是必不可少的流程,就和大家分享,来欣赏一下吧。GRE阅读真题之OG2 Passage 21OG-2Passage 21Even after numerous products made with artificial sweeteners became available, sugar consumption per capita continued to rise. Now manufacturers are introducing fat-free versions of various foods that they cla
2、im have the taste and texture of the traditional high-fat versions. Even if the manufacturers claim is true, given that the availability of sugar-free foods did not reduce sugar consumption, it is unlikely that the availability of these fat-free foods will reduce fat consumption.1. Which of the foll
3、owing, if true, most seriously undermines the argument?A. Several kinds of fat substitute are available to manufacturers, each of which gives a noticeably different taste and texture to products that contain it.B. The products made with artificial sweeteners did not taste like products made with sug
4、ar.C. The foods brought out in sugar-free versions did not generally have reduced levels of fat, but many of the fat-free versions about to be introduced are low in sugar.D. People who regularly consume products containing artificial sweeteners are more likely than others to consume fat-free foods.E
5、. Not all foods containing fat can be produced in fat-free versions.GRE阅读真题之OG2 Passage 22OG-2Passage 22Recent studies of sediment in the North Atlantics deep waters reveal possible cyclical patterns in the history of Earths climate. The rock fragments in these sediments are too large to have been t
6、ransported there by ocean currents; they must have reached their present locations by traveling in large icebergs that floated long distances from their point of origin before melting. Geologist GerardBond noticed that some of the sediment grains were stained with iron oxide, evidence that they orig
7、inated in locales where glaciers had overrun outcrops of red sandstone. Bonds detailed analysis of deep-water sediment cores showed changes in the mix of sediment sources over time: the proportion of these red-stained grains fluctuated back and forth from lows of 5 percent to highs of about 17 perce
8、nt, and these fluctuations occurred in a nearly regular 1,500-year cycle.Bond hypothesized that the alternating cycles might be evidence of changes in ocean-water circulation and therefore in Earths climate. He knew that the sources of the red-stained grains were generally closer to the North Pole t
9、han were the places yielding a high proportion of “clean” grains. At certain times, apparently, more icebergs from the Arctic Ocean in the far north were traveling south well into the North Atlantic before melting and shedding their sediment.Ocean waters are constantly moving, and water temperature
10、is both a cause and an effect of this movement. As water cools, it becomes denser and sinks to the oceans bottom. During some periods, the bottom layer of the worlds oceans comes from cold, dense water sinking in the far North Atlantic. This causes the warm surface waters of the Gulf Stream to be pu
11、lled northward. Bond realized that during such periods, the influx of these warm surface waters into northern regions could cause a large proportion of the icebergs that bear red grains to melt before traveling very far into the North Atlantic. But sometimes the oceans dynamic changes, and waters fr
12、om the Gulf Stream do not travel northward in this way. During these periods, surface waters in the North Atlantic would generally be colder, permitting icebergs bearing red-stained grains to travel farther south in the North Atlantic before melting and depositing their sediment.The onset of the so-
13、called Little Ice Age (1300-1860), which followed the Medieval Warm Period of the eighth through tenth centuries, may represent the most recent time that the oceans dynamic changed in this way. If ongoing climate-history studies support Bonds hypothesis of 1,500-year cycles, scientists may establish
14、 a major natural rhythm in Earths temperatures that could then be extrapolated into the future. Because the midpoint of the Medieval Warm Period was about A.D. 850, an extension of Bonds cycles would place the midpoint of the next warm interval in the twenty-fourth century.1. According to the passag
15、e, which of the following is true of the rock fragments contained in the sediments studied by Bond?A. The majority of them are composed of red sandstone.B. They must have reached their present location over 1,500 years ago.C. They were carried by icebergs to their present location.D. Most of them we
16、re carried to their present location during a warm period in Earths climatic history.E. They are unlikely to have been carried to their present location during the Little Ice Age.2. In the final paragraph of the passage (lines 47-59), the author is concerned primarily withA. answering a question abo
17、ut Earths climatic historyB. pointing out a potential flaw in Bonds hypothesisC. suggesting a new focus for the study of ocean sedimentsD. tracing the general history of Earths climateE. discussing possible implications of Bonds hypothesis3. According to the passage, Bond hypothesized that which of
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- GRE OG2 阅读 精选 整合
![提示](https://www.31ppt.com/images/bang_tan.gif)
链接地址:https://www.31ppt.com/p-52073.html