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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  61
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A
解析 文章是讲重新设计元素周期表。第一段讲了—：位地球科学家已经调整元素周期表，使得教学生化学时更容易些。接着是第二段。第一句是空白，需要填人。接下来的一句话是这么说的：乔治亚大学的Bruce Railsback说他是第一个创造出这样一个表的人，他突破了传统，显示了每个元素的离子而不只是元素本身。A的意思是：自从1871年门捷列夫画出元素周期表以来，许多人试图重新设计周期表。“第一个”这个信息很重要。按照从一般到具体的行文规律，前一句话应当是一般性的描述。A符合这个条件。
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