如何理解元朝对边疆少数民族地区政治统治和行政管理得到空前加强？
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从汉高祖起，皇帝身前就在嫡子中预立太子，此后大体成为定制。()
Which of the italicized parts indicates CONTRAST？
A. Press the button and the door opens by itself.
B. Many of the papers are good, and these are the best.
C. She has wronged me, and I wish to do her justice.
D. They"ve finished half of it, and that"s not bad.
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