阅读理解。
New rules and behavior standards for middle school students came out in March. Middle school is
going to use a new way to decide who the top kids are. The best students won't have high marks. They
will also be kids who do not dye (染) their hair, smoke or drink. Here are some of the new rules.
Tell the truth. Have you ever copied someone else's work on an exam? Don't do it again! That is not
something an honest student should do. If you've played computer games for two hours in your room,
do not tell your parents you have done homework.
Do more at school. Good students always love animals and care for other people. April is Bird-loving
month in China. Are your schoolmates doing anything to celebrate? Join in it! In this way, you can learn
more about animals and how to protect them. When more people work together, it makes it more fun
for everyone. Have you ever quarreled with your teammates when your basket-ball team lost? Only
working together can make your team stronger. Be friendly to the people around you. Try to think of
others, not only yourself.
Be open to new ideas. Have you ever thought that people could live on the moon? Maybe you'll
discover another Earth some day. Do not look down on new ideas. Everyone's ideas are important.
You should welcome them, because new ideas make life better for everyone.
Protect yourself. Has someone ever taken money from one of your classmates? Don't let it happen
to you. If you have to go home late, you should take care of yourself and let your parents know.
Use the Internet carefully. The Internet can be very useful for your studies. But some things on
the Internet aren't for kids, so try to look at Web pages that are good for you. You can use the Web
for fun or homework. Can't you find any good Web sites for children? Here are some: http:// kids.
east day.com; http:// www.chinakids.net.com.
1. The school new rules will help kids by telling them _____. [ ]
A. how they can study well
B. what they should do only at school
C. what is right and what is wrong
D. how they can protect themselves
2. According to the passage, which of the following is NOT true? [ ]
A. Take care of yourself when you are out.
B. Tell the truth, even when you are wrong.
C. Keep some animals to protect them.
D. Use the Internet, but keep away from bad things.
3. The main idea of the fourth paragraph is about _____. [ ]
A. making the team stronger
B. working together each others
C. learning from each other
D. being strict with others
4. Good Web sites for children can _____. [ ]
A. be a waste of time
B. help them with their studies
C. do homework for them
D. make their life easier
5. The passage tells us how to _____. [ ]
A. be top students
B. do more at school
C. care for others
D. use the Internet
rad/s的角速度匀速转动，转动开始时线圈平面与磁场方向平行,线圈通过电刷和外部 20Ω的电阻R相接.求电键S合上后，
的过程中，通过外电阻R的电量；
cos50
="50" V. （1分）
A="2.0" A， （1分）
/ (R+r) （3分）