A.
①There are similarities and differences between high school life and college life.
②For one thing, there are several similarities between high school life and college life. First, the most important task in high school and college is both studying. Studying is the most important as a student. Second, we need a goal to fight for in both high school life and college life. To lead a meaningful life, we have to set up a goal to achieve.
③For another, there are also some differences between high school life and college life. First, our studying is also the biggest difference. In high school, we are required to follow our teachers’ steps and finish their homework every day. While in college, there are no teachers giving such detailed requirements to us and we can choose study or not according to our own willing. What and how to study totally depends on us. Therefore, the ability of self-control is very important in college life. Second, the flexibility(灵活性) of time is another difference. In high
school, we have no much leisure except for our time of study. However, in college, we have much leisure controlled by ourselves except the time of classes, and we have more time to do what we like. F
ina
lly, college life is much more various and rich. Besides study, we can attend many other activities, which make our college life more wonderful.
④In short, there are both similarities and differences between high school life 
and college life. However, no matter which period we are in, we need to make full use of every day so that we will never feel regretful.
21.What totally depends on us students in college life?
A.Who to teach us.
B.When and where to study.
C.What and how to study.
D.Whether to follow the teachers’ steps.
22.How many differences are there between high school life and college life?
A.Two. B.Three. C.Four. D.Five.
23.Which is the correct structure（结构） of the passage?
A.①②-③④ B. ①②-③-④ C. ①-②③④ D. ①-②③-④
24.What’s the main idea of the passage?
A.College life.
B.High school life.
C.High school life and college life.
D.High school and college requirements.
