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  3. Reinventing the Table An earth scientist has rejigged the periodic table to make chemistry simpler to teach to students. (46)But

Reinventing the Table An earth scientist has rejigged the periodic table to make chemistry simpler to teach to students. (46)But

admin2009-06-15  44
问题                     Reinventing the Table
An earth scientist has rejigged the periodic table to make chemistry simpler to teach to students.
(46)But Bruce Railsback from the University of Georgia3 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.(47)But he has added contour lines to charge density, helping to explain which ions react with which.
"Geochemists just want an intuitive sense of what’s going on with the elements," says Albert Galy from the University of Cambridge4,(48).
(49)He explains that sulphur, for example, shows up in three different spots -- one for sulphide, which is found in minerals, one for sulphite, 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.(50).

A. There have been many attempts to redesign the periodic table since Dmitri 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.

选项
答案D
解析 第五段需填入主题句。主题句常常是概括性的。从第五段提供的信息来看，sulphur(硫磺)这个元素在三个地方出现，因此D是正确的。D说的是：有些元素Railsback列了一次以上。
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