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DA surprising finding that the inner core may recently have slowed down was published inNature Geoscience.Let's get to the core of how the Earth works to better understand thescientific findings.The Earth is composed of several layers:the crust,which is the surface we live on;themantle,which begins below the crust and ends at the outer core;the outer core,which is made ofhot liquid metal;and the inner core,which is believed to be a solid metal ball of iron andnickel.Scientists believe that the inner core may "floats"in the liquid metal and rotateindependently of the rest of Earth's layers.The study's authors propose the Earth's inner core may be experiencing a slowdown andthat this difference can be measured by observing a change in how seismic waves passthrough the Earth's center during an earthquake.Older data shows a lot of change in the wavepatterns while passing through the core,but recent data shows the changes are no longer asvisible.After analyzing the patterns of seismic waves through the decades,scientists theorize theEarth's inner core changes its rotational speed over time.Different studies have concluded thatthese changes in speed follow a pattern that may range from 20 to 70 years.The observedchanges in the inner core's behavior are likely caused by magnetic forces acting on it,which isproduced by the movement of liquid iron in the outer core.Although the core's spin seems to beindependent,we know that all layers of the Earth interact and experience effects from eachother.We have much more to learn about Earth and its physical processes.Scientists say thatmany years of continuous recording and study of seismic data are necessary to get answers.Untilthen,we must be patient.The investigation of this phenomenon will definitely lead us under thesurface and into the core of understanding our planet!32.Which layer is surrounded by the liquid metal?A.The crust.B.The mantle.C.The outer core.D.The inner core.33.Which of the following may be a reason for the inner core's slowdown?A.Magnetic forces.B.Seismic waves.C.Human activities.D.Rotation patterns.34.What does the author think of the research into the Earth's core?A.Promising.B.Ridiculous.C.Pointless.D.Questionable.35.What would be the best title for this text?A.How does the Earth Work?B.Is the Earth's Core Slowing Down?C.Is it Necessary to Record Seismic Data?D.What is Special about the Earth's Core?第二节（共5小题；每小题2.5分，满分12.5分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项，选项中有两项为多余选项。高二英语试卷第6页共10页