From the first paragraph we can see that before entering college, students must______.

A．they have to do extra preparation to pass the entrance exams
B．private schools are not expensive
C．course work in college is more difficult
D．college entrance exams are more difficult

A．study harder than they did in high school
B．study as hard as in high school
C．find college studies easier than high school work
D．find it easier to go to graduate school