2017年职称英语理工类B级补全短文备考习题【八】

时间:2016-05-11  来源:大考吧  

  2017年职称英语理工类B级补全短文备考习题(八)

  Reinventing the Table

  An earth scientist has rejigged the periodic table1 to make chemistry simpler to teach to students._ _1_But Bruce Railsback from the University of Georgia says he is the first to create a table that breaks with tradition and shows the ions of each element rather than just the elements themselves.“I got tired of breaking my arms trying to explain the periodic table to earth students,”he says, criss-crossing his hands in the air and pointing to different bits of a traditional table. __2__But he has added contour lines to charge density, helping to explain which ions react with which."Geohemists just want an intuitive sense of what's going on with the elements," says Albert Galy from the University of Cambridge4,_ _3_  __4____He explains that sulphur, for example , shows up in three different spots — one for sulphide, which is found in minerals, one for su1phite, and one for su1phate, which is found in sea sa1t, for instance.He has also inc1uded symbols to show which ions are nutrients,and which are common in soi1 or water.____5____

  A. There have been many attempts to redesign the periodic table since DmM Mendeleev2 drew it up in 1871.

  B. Railsback has still ordered the elements according to the number of protons they have.

  C. “I imagine this would be good for undergraduates.”

  D. Railsback has listed some elements more than once.

  E. And the size of element’s symbol reflects how much of it is found in the Earth’s crust.

  F. The traditional periodic table was well drawn.

  参考答案: ABCDE

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