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1、2021年职称英语考试理工类B级补全短文训练及答案4 职称英语考试综合BReinventing the TableAn earth scientist has rejigged(调整) the periodic table (元素周期表)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 th
2、e ions of each element rather than just the elements themselves.“I got tired of breaking my arms trying to e_plain the periodic table to earth students，” he says， criss-crossing(交叉) his hands in the air and pointing to different bits of a traditional table._(2)_But he has added contour lines to char
3、ge density， helping to e_plain which ions(离子) react with which.Geochemists just want an intuitive sense of whats going on with the elements，“ saysAlbert Galy from the University of Cambridge _(3)_(4)_He e_plains that sulphur(硫磺)， for e_ample， shows up in three differentspots _one for sulphide(硫化物)，
4、which is found in minerals， one for sulphite(亚硫酸盐)， and one for sulphate， which is found in sea salt， for instance.He has also included symbols to show which ions are nutrients， and which are common in soil or water._(5)_练习：A There have been many attempts to redesign the periodic table since Dmitri
5、Mendeleevit up in 1871.B Railsback has still ordered the elements ac， cording 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 elements symbol reflects how much of it is found in the Earths crust.F The traditional periodic table was well drawn.练习答案1A 2B 3C 4D 5E第 3 页 共 3 页