People who are near-sighted can only see things that are very close to their eyes, Everything else seems blurry(=unclear). Many people who do a lot of work, such as writing, reading and sewing become near-sighted. Then

　　People who are far-sighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in 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. They have what is called astigmatism (散光). 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.

　　Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle (角度). To prove this to yourself, look at an object our of one eye; then look at the same object out of your other eye. You will find the object's relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.

24. We should take good care of our eyes______________ .

　　A. only when we can see well

　　B. only when we cannot see perfectly

　　C. even if we can see well

　　D. only when we realize how important our eyes are

25. When things far away seem indistinct(模糊不清) , one is probably ___________.

　　A. near-sighted B. far-sighted

　　C. astigmatic D. suffering from cataracts

26. Having two eyes instead of one is particularly useful for_______ .

　　A. seeing at night B. seeing objects far away

　　C. looking over a wide area D. judging distances

27. People who suffer from astigmatism have ______________.

　　A. one eye bigger than the other

　　B. eyes that are not exactly the right shape

　　C. a difficulty that can be corrected by an operation

　　D. an eye difficulty that cannot be corrected by glasses 　

C

It feels like every time my mother and I start to have a conversation, it turns into an argument. We talk about something as simple as dinner plans and suddenly, my mother will push the conversation into World War III. She'll talk about my lack of a bright future because I don't plan to be a doctor. And much to her disappointment, I don't want to do any job related to science, either. In fact, when I was pushed to say that I planned to major(主修) in English and communications, she nearly had a heart attack. "Why can't you be like my co-worker's son?" she bemoans all the time. Her co-worker's son received a four-year scholarship and is now earning 70,000 dollars a year as an engineer. I don't know what to answer except that I simply can't be like Mr. Perfect as I've called the unnamed co-worker's son. I can't be like him. I'm the type of person who loves to help out in the community, write until the sun goes down, and most of all, wants to achieve a career because I love it, not