阅读理解。
Most American school buildings look the same. There is always a gym, a big room for basketball
and other sports. There is a lunchroom, a school library, and an auditorium. They have rooms for
bands and computers, workshops to work with paint. In many schools students learn running, tennis,
swimming and some other sports. And the games between schools are often very exciting.
In the USA, school buses are the safest way for children to go to school. Students spend about
an hour and a half in the school buses every day.
For many students in the USA high schools, the most important things in their life are making friends,
being popular and having a good social life. Many students go out together after school to fast food
restaurants, movies or dances.
In the USA, students take some tests each year. Every year 71% of American students graduate
from high school and 40% of high school students go on to college.
1. Most American schools have the same buildings except______.
A. A gym
B. A lunchroom
C. A clothes store
D. A room for bands
2. What does the writer think of games between schools?
A. Exciting.
B. Interesting.
C. Boring.
D. Tiring.
3. Which is the safest way for students to go to school in the USA?
A. By bike.
B. On a school bus.
C. On foot.
D. By train.
4. Which is the most important thing in American students' life?
A. Studying hard to be the number one in class.
B. Helping mothers do housework after school.
C. Visiting grandparents every weekend.
D. Meeting new friends and joining clubs.
5. How many students will go to college if there are 2000 students in a school?
A. 200 students.
B. 500 students.
C. 800 students.
D. 1000 students
=______．
，
，即sinx+cosx在(-∞，+∞)内有界，因为有界变量与无穷小量的乘积仍为无穷小量，所以原极限为零．