A few degrees can make a big difference when it comes to food storage.Foods can go bad if they get too warm.But for many of the world's poor, finding a good way to keep food cool is difficult.Refrigerators are costly and they need electricity. Yet spoiled food not only creates health risks but also economic losses.Farmers lose money when they have to throw away products that they cannot sell quickly. But in nineteen ninety-five a teacher in northern Nigeria named Mohammed Bah Abba found a solution.He developed the "Pot-in-Pot Preservation/Cooling System." It uses two round containers made of clay.A smaller pot is placed inside a larger one.The space between the two pots is filled with wet sand.The inner pot can be filled with fruit, vegetables or drinks.A wet cloth covers the whole cooling system. Food stored in the smaller pot is kept from spoiling through a simple evaporation process.Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.The evaporation process creates a drop in temperature of several degrees.This cools the inner pot and helps keep food safe from harmful bacteria.Some foods can be kept fresh this way for several weeks. People throughout Nigeria began using the invention.And it became popular with farmers in other African countries.Mohammed Bah Abba personally financed the first 5,000 pot-in-pot systems for his own community and five villages nearby. In 2000, the Rolex Watch Company of Switzerland honored him with the Rolex Award for Enterprise.This award recognizes people trying to develop projects aimed at improving human knowledge and well-being.A committee considers projects in science and medicine, technology, exploration and discovery, the environment and cultural history.Winners receive financial assistance to help develop and extend their projects.The award is given every two years.The most recent one was given last year. The evaporation process of the cooling system is used to _ . A) prevent the loss of water B) cause dry and wet air to exchange C) keep the stored food dry D) take heat away from the inner pot
D
(Question)
Today almost everyone knows computers and the Internet. If I ask you "What is the most important in your life ?" maybe you will say "Computers and the Internet." The first computer was made in 1946. It was very big but it worked slowly . Today computers are getting smaller and smaller. But they work faster and faster. What can computers do? A writer has said, "people can't live without computers today." The Internet came a little later than computers. It is about twenty-five years later than computers. But now it can be found almost everywhere. We can use it to read books, write letters, do shopping, play games or make friends. Many students like the Internet very much. They often go into the Internet as soon as they are free. They make friends on the Internet and maybe they have never seen these friends. They don't know their real names, ages, and even sex . They are so interested in making the "unreal friends" that they can't put their hearts into study. Many of them can't catch up with others on many subjects because of that. We can use computers and the Internet to learn more about the world. But at the same time, we should remember that not all the things can be done by computers and the Internet. The Internet can not be used for _ . A) studying B) shopping C) thinking D) playing
(Answer)
C
Ques: While Jennifer was at home taking an online exam for her business law class, a monitor a few hundred miles away was watching her every move. Using a web camera equipped in Jennifer's Los Angeles apartment, the monitor in Phoenix tracked how frequently her eyes moved from the computer screen and listened for the secret sounds of a possible helper in the room. Her Internet access was locked - remotely - to prevent Internet searches , and her typing style was analyzed to make sure she was who she said she was: Did she enter her student number at the same speed as she had in the past? Or was she slowing down? In the battle against cheating, this is the _ and a key to encourage honesty in the booming field of online education. The technology gives trust to the entire system, to the institution and to online education in general. Only with solid measures against cheating, experts say, can Internet universities show that their exams and diplomas are valid - that students haven't just searched the Internet to get the right answers. Although online classes have existed for more than a decade, the concern over cheating has become sharper in the last year with the growth of "open online courses." Private colleges, public universities and corporations are jumping into the online education field, spending millions of dollars to attract potential students, while also taking steps to help guarantee honesty at a distance. Aside from the web cameras, a number of other high-tech methods are becoming increasingly popular. Among them are programs that check students' identities using personal information, such as the telephone number they once used. Other programs can produce unique exam by drawing on a large list of questions and can recognize possible cheaters by analyzing whether difficult test question are answered at the same speed as easy ones. As in many university classes, term papers are scanned against some large Internet data banks for cheating. Some programs can find out possible cheaters by _ . A) checking the question answering speed B) producing a large number of question C) scanning the Internet test question D) giving difficult test question
Ans: A
(Q).
One day when the famous American scientist Edison was on his way home, a young man stopped him and required to have a word with him. Edison accepted his request. The young man asked, "How can you invent so many things and achieve your fame?" The scientist said, "It seems that you have been thinking of becoming famous every day." The young man nodded, "Yes. I have been dreaming of being a person as notable as you. Every minute I am thinking of how to become reputable. I don't know when I can achieve my fame (,)." Edison told him, "Don't worry, young man. If you want to be a famous man this way, you will have to wait until you die!" "Why should I?" the young man was puzzled. Edison said, "What you dream is actually a high building. You never think of how to build it with bricks . Thus the building will never come into reality . However, your story can serve as a mirror. People will remember you because of your illness and laziness. They will often speak of your name while they give warnings to their children. Aren't you a notorious person by then?" The story mainly tells us _ . A) a person needs high spirit B) one shouldn't dream of becoming famous C) only by hard work can one's wish come into reality D) one person shouldn't be idle and lazy
(A).
C
Ques: When Tom finished his studies at the university , he began to look around for a job. He did not know what he would like to do, but one of his uncles had worked for the government for thirty years, and he advised Tom to try to get a job of the same kind, so he went for an exam one day. He was successful, and his first job was in a large government office in London. When Tom had been working there for a few weeks, his uncle came to visit the family one Saturday evening. He was pleased that his nephew had got a job working for the government, and he asked him a lot of questions about it. One of the questions he asked was, "How many people work in your department , Tom?" The young man thought for a few moments and then answered, "About half of them, Uncle Jim." In fact Tom's answer means that _ . A) the people working in the government office were in many groups and they worked in turn B) most of the government workers were not working hard C) only half of the government workers went to work on time D) the government office had more people than needed
Ans:
D