阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
[2022·济宁市高一检测]What's your feeling when you step into senior high school? It is a completely new experience, but you shouldn't worry. We've got some tips to help you.
●You're not alone
Remember that everybody else in your grade is in the same boat. You may not notice it, but they're just as nervous as you are.
Moving up to senior high school is a chance, not a problem. Things are different, and all you need to do is to be polite and learn the new rules.
●The teachers will help you
If you don't know what to do or are worried about something, then ask for help. Teachers are probably the best people to turn to because they have experience in helping new students. Pay attention to what your teachers say.
●Everything changes
There are lots of differences between junior high school and senior high school. You will take lessons with different teachers in different schools. You will have homework for different subjects on different days, so make sure you get organized.
●Other points
If you've got an elder brother or sister at senior high school, then ask them for advice. Be yourself! It sounds simple, but things will become much better if you just act naturally.
Going to bed early makes a difference. You'll also find it easier to get up in the morning!
21．The author says that you're not alone because other students________．
A．are polite and friendly
B．will help you if possible
C．will learn the new rules with you
D．feel the same as you do
22．What does the author think of moving up to senior high school?
A．It is a difficult problem. B．It sounds simple.
C．It's a good chance. D．It's worrying.
23．Which of the following does the author advise you to do?
A．Don't be shy.
B．Just act naturally.
C．Change yourself.
D．Pay attention to what your classmates say.
24．What's the main purpose of the passage?
A．To tell students about a new experience.
B．To tell students how to make full use of time.
C．To help students that are going to senior high school.
D．To tell students that teachers are the best helpers.
