Read the following article and select the best answer. Article: For thousands of years, people thought of glass as something beautiful to look at. Only recently have they come to think of it as something to look through. Stores display their goods in large glass windows. Glass bottles and jars that hold food and drink allow us to see the contents. Glass is used to make eyeglasses, microscopes, telescopes, and many other extremely useful and necessary objects. Until the Second World War, most of the glass used for optical instruments was imported from Europe. However, during the war Americans could not get European glass, and they were forced to make their own. Therefore, new kinds of glasses were developed that had been previously unknown. These new effects were achieved by mixing other chemical elements with the sand. Some of these new glasses are very strong and can resist many kinds of shocks. Legend has it that a very hard glass was invented by a Roman who showed his discovery to the Emperor. When the Emperor saw the glass he feared that it would become more valuable than gold and sliver, making his treasure worthless. Therefore, he had the glassmaker killed, and the secret was not discovered again for hundreds of years. In the present century, safety glass was invented for use in modern cars and planes. Safety glass is made by placing a layer of plastic between two layers of plate glass. When the outside layer of glass is broken, the pieces do not scatter and injure people. Some glass of the type is strong enough to resist bullets . Although nowadays plastics have replaced glass under conditions where glass might be easily broken, there are new uses being developed, for the greatest advantage of glass is that its component parts are inexpensive and can be found all over the world. Question: Why are new uses of glass being developed? - Because glass is not as safe as plastics. - Because glass is cheap and easily obtainable. - Because glass is not as strong and durable as plastics. - Because glass is more and more widely used.
Because glass is cheap and easily obtainable.

Read the following article and select the best answer. Article: Dozens of dolphins swam out of the polluted waters of Haifa Harbor on Tuesday.This was the first time that dolphins had visited this crowded Mediterranean port,and researchers were surprised and delighted by the unexpected event. Between 40 and 50 of the dolphins appeared in the busy port on Tuesday morning,obviously drawn by the fishrich waters of Haifa Harbor. However,the bay is also full of harmful chemicals. Aviad Sheinin,professor of Haifa University's Maritime Studies Department,said he didn't think the dolphins were harmed by the pollution,but he hoped that they would swim back to the sea soon. "It seems that they are quite relaxed. They don't seem to be stressed," he said. Haifa Harbor is lined by chemical companies that have been pouring poisonous waste into the water for decades. While pollution levels have dropped in recent years,the water is still considered a health hazard. "There are lots of fish in Haifa Harbor. Unfortunately we couldn't tell the dolphins that the fish are not healthy;and I don't know what the result will be," he told Israel Army Radio.Hundreds of Haifa residents gathered around Haifa Harbor to see the interesting sight,and researchers said this provided a rare chance to film and study the roughtoothed dolphins. In addition to the dozens of dolphins which swam into the port on Tuesday,a similar number stayed outside the breakwater .Later Tuesday the dolphins left the port but remained near the entrance and Israel's coast guard was patrolling the area to try to make sure the dolphins didn't reenter the poisonous waters. Relatively little is known about roughtoothed dolphins,which are usually found in deep and warm tropical waters. Question: Aviad Sheinin's words suggest that _ . - the dolphins might affect the existence of fishes in Haifa port - he is curious about the dolphins - he will do research on the dolphins - he is uncertain about what will happen to the dolphins
he is uncertain about what will happen to the dolphins

Read the following article and select the best answer. Article: You may have heard some respectable elders say, "It's not what you want in this world, but what you get." Psychology teaches that you do get what you want if you know what you want and want the right things. You can make a mental blueprint of a desire as you would make a blueprint of a house, and each of us is continually making these blueprints in the general routine of everyday living. If we intend to give a dinner for friends, we plan the menu, make a shopping list, and decide which food to cook first, and such planning is essential and necessary for any type of meal to be served. Similarly, you can make a blueprint for your could-be-job, take a sheet of paper, and write a brief account of yourself. In making a blueprint for a job, begin with yourself, for when you know exactly what you have to offer, you can intelligently plan where to sell your service. This account of yourself is actually a description of your working life and should include education, experience and references. Such an account is valuable. It can be referred to filling out standard application blanks and it is extremely helpful in personal interviews. While talking to you, your could-be employer is deciding whether your education, your experience and other qualifications will pay him to employ you, and your abilities must be displayed on an orderly and reasonably connected manner. When you have carefully prepared a blueprint of your abilities and desires, you have something exact to sell. Then you are ready to hunt for a job. Get all the possible information about your could-be job. Make your eyes and ears open, and use your own judgment. Spend a certain amount of time each day seeking in the employment you wish for, and keep in mind: Obtaining a job is your job now! Question: In the passage, the author mainly intends to point out the importance of _ . - writing up a detailed plan for a job interview - keeping a blueprint of what you want to do - drawing a description of your working life - seeking the employment you want
keeping a blueprint of what you want to do