Are you carrying too much on your back at school? You’re not alone. Back experts in the United States are worried that young students are having back and neck problems as a result of carrying too much in their backpacks (schoolbags)
“It hurts my back when I run,”said Oberlin Reyes, a student in Virginia. “It’s hard to go up the stairs with my backpack,because it’s too heavy,”
Oberlin was among students whose backpacks were weighed for a week in a recent study.
They had regular backpacks with two straps(带子)to carry them, but a number of students with heavy loads had switched to rolling backpacks (which have wheels and can roll on the ground).
Shirley Park, whose backpack weighed 10 kilograms,said she changed to a rolling backpack because she was starting to have back  pain.
How much is too much?Experts say students should carry no more than 10 to 15 percent of their own body weight.
A few students had one suggestion to lighten the load:less homework.
P.S.( 附)Doctor’s suggestion:
1 Lighten the load. Clean out binders(活页材料)and take home only the books you need that night.
2 Wide straps are better. They send out the weight over your shoulders more evenly(均匀)。 And be sure to wear both straps rather than hanging the pack over one shoulder.
3. Pack smart. The heavier things should be packed closed to the back.
4.Bend both knees when you pich up the pack ,and don’t just bend over  at the waist.(腰)
【小题1】“_________”is the main idea of the text.
A The problem of backpacks is worth studying.
B The problem made by heavy backpacks
C What is the best backpack for a student.
D      How to make students’backpacks light.
【小题2】According to Oberlin Reyes and Shirley Park, we know________.
A students have to do too much homework
B students have to carry several backpacks
C backpacks without wheels are bad for students
D too much homework leaves students no free time
【小题3】The expression “switched to” in the text perhaps means________.
A started to use  B turned to  C caught up   D used for
【小题4】According to the passage ,it’s better for a student of 40 kilograms to carry a backpack of _____at most by the words of experts.
A 10kg    B 8kg  C 6kg    D 7kg
【小题5】 If students follow the doctor’s suggestions they ________.
A may lighten their backpacks
B can learn how to help themselves
C may feel their backpacks are lighter
D will know how to wear backpacks

When we can see well, we do not think about our eyes often. It is only when we can not see perfectly that we come to see how important our eyes are.

People who are nearsighted can only see things that are very close to their eyes. Many people who do a lot of close work, such as writing and reading, become nearsighted. Then they have to wear glasses in order to see distant things clearly.

People who are farsighted face just the opposite problem. They can see things that are far away, but they have difficulty reading a book unless they hold it at arm’s length. If they want to do much reading, they must get glasses too.

Other people do not see clearly because their eyes are not exactly the right shape. This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts. Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them.

When night falls, colors become fainter to the eyes and finally disappear. After your eyes have grown used to the dark, you can see better if you use the side of your eyes rather than the centers. Sometimes, after dark, you see a small thing to one side of you, which seems to disappear if you turn your head in its direction. This is because when you turn your head, you are looking at the thing too directly. Men on guard duty sometimes think they see something moving to one side of them. When they turn to look straight at it, they can not see it any more, and they believe they were mistaken. However, this mistake happens because the center of the eye, which is very sensitive in daylight, is not as sensitive as the sides of the eye after dark.

1.We don’t know that our eyes are of great importance until ________.

A. we think about our eyes

B. we cannot see clearly

C. we wear glasses

D. we have to do much reading

2.According to the passage, a ________ is more likely to be nearsighted.

A. tailor??? B. doctor??? C. guard??? D. painter

3.People who are farsighted ________ .

A. cannot do a lot of close work without glasses

B. can only see things that are very close to their eyes

C. have difficulty reading a book if they hold it at arm’s length

D. have the same problem as the nearsighted people

4.To see a small thing at night, it is better to look ________ .

A. with wide open eyes

B. with half shut or narrowed eyes

C. straight at it

D. in a slightly different direction

Once upon a time，there were two good friends．One was called Jack and the other was called James．One day，the two friends were walking through the desert．During the journey they had a quarrel，and Jack couldn’t control himself and hit James in the face．James felt hurt，but he didn’t say anything．Instead，he wrote in the sand，“Today my best friend Jack hit me in the face．”
They kept on walking until they found an oasis(绿洲)．They decided to get some water there．Suddenly James had trouble in the water，he fell into the mire(泥潭)and was in danger．Jack saved him at once．When he felt all right，he wrote on a stone，“Today my best friend Jack saved my life．”Jack was very surprised and asked James，“After I hurt you，you wrote in the sand and now you write on the stone．Why?”James replied，“When someone hurts us，we should write it down in the sand so that the wind of forgiveness can blow it away．But when someone does anything good for us，we must write it on the stone，so no wind can blow it away．”
Since then，the two good friends have never quarreled with each other again and they got on better with each other．
Hatred(仇恨)can bring you nothing but unhappiness．If you don’t forgive others，you are making trouble for yourself Keep a peaceful heart all the time and remember to be always thankful to others!
【小题1】What happened when Jack hit his friend James in the face?