阅读理解。
"All work and no play makes Jack a dull boy." is a popular saying in the USA. We need to rest as we
need to work. Without enjoying recreation (娱乐) we can't keep ourselves in good health and high spirit
(精神), and therefore (因此) we can't continue working well.
People have different ways to relax themselves, but the most popular way is to take part in some sports.
There are individual (个人的) sports, such as swimming, running, skating and climbing mountains. There
are also team sports, such as basketball, volleyball and football. Many people also like some forms of indoor
recreation, such as singing, dancing and watching TV. It doesn't matter whether you like indoor recreation
or outdoor sports. You need to play well if you want to work well.
1. If we want to be healthy and enjoy life, we _____.
A. can't work at all
B. need work and recreation
C. must work all the time
D. should sleep all the time
2. Football is a kind of ______.
A. team race
B. individual sport
C. team sport
D. individual exercise
3. The word "dull" in the passage means ______.
A. nice
B. good
C. happy
D. foolish
4. The most popular way of relaxing is to ______.
A. study
B. read English stories
C. work hard
D. take part in some sports
5. Which of the following statements is RIGHT?
A. Indoor recreation is bad for our health.
B. Recreation can help us work better.
C. "All work and no play makes Jack a dull boy." is a Chinese saying.
D. If you want to keep fit, you can only take part in team sports.
，则B点离地的高度为__ __ m 。（g取10 m / s2）