2. 外语
  3. A、During the first half of their careers. B、During the first third of their careers. C、During the second half of their careers.

A、During the first half of their careers. B、During the first third of their careers. C、During the second half of their careers.

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问题  
选项 A、During the first half of their careers.
B、During the first third of their careers.
C、During the second half of their careers.
D、During the last third of their careers.
答案B
解析 事实细节题。短文中间部分提到，一个上溯至牛顿的数学家族谱图让研究人员得以对7 259名数学家进行研究，这些数学家都毕业于1900到1960年。人际网数据显示，与教职生涯的最后的三分之一相比，有建树的学者在教职生涯的前三分之一时间内培养了更多的好学生。
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大学英语六级

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