托福TPO 8 听力Lecture第4篇第1题_In the beginning of the lecture a student asks a question about the periodic table. How does the story of element 43

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题目

1. In the beginning of the lecture a student asks a question about the periodic table. How does the story of element 43 answer her question?

By providing an example of an element whose place in the periodic table was moved.

By providing an example of an element whose existence was predictable from the periodic table.

By providing an example of an element which scientists predicted was formed from uranium.

By providing an example of an element that can only be made artificially.

题目解析

学生问教授元素周期表可预测是什么意思。教授说早期的周期表其实有空缺，但是人们可以通过原子数去预测元素在周期表中的元素位置。然后举出 43 号元素的例子，之前 42 号元素和 44 号元素中间有缺失，但是人们通过预测存在 43 号元素，只是暂时没有被发现而已。所以教授通过例子告诉学生某些存在的元素是通过周期表预测得知的，选项 B 正确。

答案: B

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