Reading Comprehension Each of the following passages is followed by some questions or unfinished statements. For each of them, there are four choices marked A,B,C and D. Read the following carefully and write the corresponding letter in the blank.(30 points, 3 points for each) Questions 1 to 5 are based on the following passage: When we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are. 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 of ten 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. 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 objec t’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. Questions 6 to 10 are based on the following passage: The most important use of drifting bottles is to find ocean currents. When the position and direction of currents are known, ships can use the forward movement of a current or stay away from currents that would carry them off their course. Benjamin Franklin was one of the first to use bottles in the study of currents. He wondered why British mall ships needed a week or two longer than U.S. ships needed in order to cross the Atlantic Ocean. Franklin thought the Gulf Stream might explain this difference. Franklin talked with captains of U.S. ships. He found that they knew each turn of the Gulf Stream. They used the current in every possible way. From his talks with the captains. Franklin made his first map of the Gulf Stream. Then he checked his map by using sealed bottles. The map that he finally made is still used, with only a few changes, today.