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（白内障）. 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（不清楚） 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[来源:Z,xx,k.Com]

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

A. student    B. runner    C. guard    D. worker

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

Now, we know that if we do not get enough vitamins, we are at risk of developing a number of diseases. As a result, vitamin supplements（补品），though expensive, are popular with people who worry that they are not getting enough vitamins from the foods they eat. But contrary to what many people think, medical experts have found little evidence that most supplements do anything to improve health or protect against disease.
In fact, medical experts warn that taking too many of some vitamins can be harmful. For example, too much vitamin E can cause bleeding. People should discuss what vitamins they take with their doctors, as some vitamins can produce harmful side effects when mixed with medicines.
Experts, however, do say that sometimes vitamins can help prevent disease. People who know they lack a particular vitamin should take vitamin supplements. Some older adults, for example, may not have enough vitamin B-twelve. This is because, as people get older, their body loses its ability to take it from foods. Also, people who spend much time inside may need some extra vitamin D as the skin makes this vitamin from sunlight.
Different vitamins are found in different foods. Vitamin A is found in fish liver oil. It also is in the yellow part of eggs. Sweet potatoes, carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A. Vitamin B-twelve is found in green leafy vegetables and other foods, like fruits. Vitamin K can be found in pork products.
In fact, for most people, a balanced diet can ensure enough of the vitamins our bodies need. So, it is important for us to eat a mixture of foods every day to ensure that we get enough vitamins our bodies need.
【小题1】Vitamin supplements are popular with people because ________. 

Now, we know that if we do not get enough vitamins, we are at risk of developing a number of diseases. As a result, vitamin supplements（补品），though expensive, are popular with people who worry that they are not getting enough vitamins from the foods they eat. But contrary to what many people think, medical experts have found little evidence that most supplements do anything to improve health or protect against disease.

In fact, medical experts warn that taking too many of some vitamins can be harmful. For example, too much vitamin E can cause bleeding. People should discuss what vitamins they take with their doctors, as some vitamins can produce harmful side effects when mixed with medicines.

Experts, however, do say that sometimes vitamins can help prevent disease. People who know they lack a particular vitamin should take vitamin supplements. Some older adults, for example, may not have enough vitamin B-twelve. This is because, as people get older, their body loses its ability to take it from foods. Also, people who spend much time inside may need some extra vitamin D as the skin makes this vitamin from sunlight.

Different vitamins are found in different foods. Vitamin A is found in fish liver oil. It also is in the yellow part of eggs. Sweet potatoes, carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A. Vitamin B-twelve is found in green leafy vegetables and other foods, like fruits. Vitamin K can be found in pork products.

In fact, for most people, a balanced diet can ensure enough of the vitamins our bodies need. So, it is important for us to eat a mixture of foods every day to ensure that we get enough vitamins our bodies need.

1.Vitamin supplements are popular with people because ________. 

2.From the passage, we can learn that medical experts advise people _________.

3.For people who lack Vitamin B-twelve, they can eat more from _______.

A. sweet potatoes   B. pork products   C. green leafy vegetables  D. eggs

42. What would be the best title of the passage?

A. Getting enough vitamins through a balanced diet.

B. Vitamin supplements do harm to our health.

C. Vitamins are important to our health.

D. Lacking vitamins can cause many diseases.

Growing older is unavoidable while growing up is optional. These words have been passed on in the loving 11­­____of Rose.

On the first day of school our professor challenged us to get to know someone, so I 12____ to find a little old lady looking at me with a smile. She said，"Hi， handsome! My name is Rose. I'm eighty-seven years old. Can I give you a 13____ ？" I laughed and 14____ responded ，then followed a giant squeeze. “ 15____ are you in college at such an innocent age?” I asked. "I'm here to meet a rich husband, get married ，have a couple of kids..." I was 16____ what it was that motivated her to be taking on this 17____ at her age. “I always dreamed of having a college education and now I 18____ it!” Later, we became friends.

Rose became a campus celebrity and she easily made friends 19____ she went. On one 20____ Rose was invited to speak at our football banquet. Her prepared cards dropped before she 21____ the speech. A little 22____ , she simply 23____ her throat and began，"We do not stop playing 24____ we are old; we grow old because we stop playing. There are certain secrets to stay 25____ , being happy and achieving success. You've got to have a dream. When you 26____ your dreams ，you die.”…

At the end of the year Rose finished her college education. One week after graduation Rose died 27____ in her sleep. Over two thousand college students 28____ her funeral in honor of the wonderful woman who taught by 29____ that it's never too late to be all you can possibly be.

Anybody can grow older, which doesn't 30____ any talent or ability. The key is to grow up by always finding opportunities in change.