课程咨询

GRE首页 GRE课程 GRE动态 0元讲座 GRE模考网站

新东方在线 > GRE > GRE阅读 > 正文
扫码关注掌握一手留学资讯

扫码关注掌握一手留学资讯

回复XDF免费领

水平测试和备考资料

扫码关注公众号

GRE阅读题目解析：地震波反射法

2016-12-22 12:22:00来源：网络

　　【GRE阅读题目解析:地震波反射法】GRE考试考什么？GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:地震波反射法，答案见下一页，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　查看全部：GRE阅读答案解析(汇总)

　　GRE阅读题目解析:地震波反射法

　　P3

　　Because of its accuracy in outlining the Earth's subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves. In field practice, a subsurface is mapped by line arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern. As each source is activated, it generates a wave train that moves downward at a speed determined uniquely by the rock's elastic characteristics. As rock interfaces are crossed, the elastic characteristics encountered generally change abruptly, which causes part of the energy to be reflected back to the surface, where it is recorded by seismic instruments. The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains, and for multiple reflections from the rock interfaces. Then the data acquired at each of the specific source locations are combined to generate a physical profile of the subsurface, which can eventually be used to select targets for drilling. (162 words)

　　For the following question, consider each of the choices separately and select all that apply

　　4. According to the passage, in the seismic-reflection method which of the following have a significant effect on the signal detected by the seismic instruments

　　(A) presence of unrelated wave trains

　　(B) placement of the seismic instruments

　　(C) properties of rocks through which the wave train has traveled

　　5. It can be inferred from the passage that the seismic-reflection method would be likely to yield an inaccurate physical profile of the subsurface in which of the following circumstances?

　　(A) If the speed at which the wave train moved downward changed

　　(B) If the receiver were not positioned directly at the wave-train source

　　(C) If the rock on one side of a rock interface had similar elastic characteristics to those of the rock on the other side

　　(D) If the seismic records obtained for the different sources in a grid were highly similar to each other

　　(E) If there were no petroleum deposits beneath the area defined by the grid of wave-train sources

　　6. Which of the following best describes the organization of the passage?

　　(A) A method is criticized, and an alternative is suggested.

　　(B) An illustration is examined, and some errors are exposed.

　　(C) An assertion is made, and a procedure is outlined.

　　(D) A series of examples is presented, and a conclusion is drawn.

　　(E) A hypothesis is advanced, and supporting evidence is supplied.

　　点击下一页查看答案：

本文关键字: GRE阅读 GRE阅读真题

上一页 1 2 下一页

添加新东方美研助教回复【GRE】获取

模考真题|写作题库|阅读机经|佛脚词汇

更多资料

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多内容

关注新东方美研助教

回复【GRE】获取备考必看资料包

新东方美研备考资料
GRE录播课（全科班/单项班） GMAT6-8人直播VIP小班 托福直播精讲班（30天/60天）
更多>>
更多惊喜>>

添加美研助教号，
回复【GRE】获取备考必看资料包

  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加美研助教号】，回复对应关键字领取学习资料。
更多>>
更多资料
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10