Good health is very important．Everyone should do all he can to stay healthy．Being in good health means having both body and mind in good order, free from illness and pain．
Good food, plenty of water, cleanness and plenty of rest all help in keeping our machines running as they should．Food does many things for our bodies．It gives what we need for keeping good health．It gives us energy for work and play．No food gives everything we need．We should eat foods of different kinds．Having enough to eat is not the same as having the right food．
The water we drink helps wash away wastes formed inside our bodies．It also puts back the water we lose when we perspire(流汗)．Our bodies are actually more than half water．We must drink enough to replace what we lose．
We feel better and look better when we are clean．A bath every one or two days is a good rule for most of us．Brushing our teeth is important part of keeping clean．
Sleep is the best kind of rest．Growing children need more sleep than grown-ups．Children's bodies not only have to be repaired; they also have to grow, No one's body can grow bigger properly while he is working and playing and wearing it out (疲劳)．
It has been useful to work for good health．Millions of years ago, people live only 20 years．Now people can live about 70 years．It has gone up 20 years just since the beginning of the present century．
(1)
You should have foods of different kinds because ________．
[ ]
A．
some foods are not good
B．
no food can give everything you need
C．
different foods taste different
D．
different people like different foods
(2)
We must drink enough water to replace what we lose．Here replace means．
[ ]
A．
感觉
B．
放置
C．
减少
D．
代替
(3)
At the beginning of the present century people live about ________．
[ ]
A．
20 years．
B．
70 years
C．
40 years
D．
50 years
(4)
Which of the following is NOT true?
[ ]
A．
Grown-ups sleep less than children because they have a lot of work to do．
B．
If one's mind does not work well, he is not considered to be healthy．
Most American children eat potatoes．But many children don't know what of the potato is the best for food．Take a knife and cut from the middle of the potato a piece as thin as paper．Hold the piece between your eyes and light．You will see that the potato has skin(皮)，an outside rim(边缘) and an inside part．The outside rim which is right under the skin of the potato，is the most valuable part of all．But this is often thrown away with the skin．Even the skin itself is better for food than the inside．When eating a cooked potato，if you choose the inside and leave the outside，you are throwing the best part of it．If you can't eat the whole potato，eating the outside rim and leaving the inside will do．
(1)
How many parts does the potato have?
A．It has only one part，outside rim．
B．It has two parts，skin and outside rim．
C．It has three parts，skin，outside rim and an inside part．
D．It has four parts，middle，skin，outside rim and an inside part．
[ ]
(2)
What is the best part of a potato?
A．Outside rim． B．Inside part． C．Middle． D．Skin．
[ ]
(3)
What should you eat first if you can't eat the whole potato?
A．Skin only． B．Inside． C．Outside rim． D．Part of it．
