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 out 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.

　　68. 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

　　69. 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

　　70. 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

　　71. Having two eyes instead of one is particularly useful for _____.

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