阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。
In my experience, freshmen today are different from those I knew when I started as a professor 25 years ago. College has always been demanding both academically and socially. But students now are less mature and often not ready for the responsibility of being in college.
