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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  69
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B
解析 第三段的第一句话是这么说的：“在给学生解释元素周期表时我的手臂都要断了，”他这么说时在空中来回交叉双手，指点传统周期表中不同的元素。这一句话是讲Bruce Railsback重新制作元素周期表的原因。从主题发展来看，这句话似乎跟上文连不上，但这是一篇报道，插入了一些背景信息和其他人的评论。从第二段的最后一句话来看，B比较合适，因为都是讲元素。B说的是：Railsback仍然按照元素所有的质子数排列元素。注意：D也是讲元素。但是B中有still(仍然)这个词，它是衔接第二段的最后一句话的。
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