In the earliest stages of man's development he had no more need of money than animals have. He was content with very simple forms of shelter, made his own rough tools and weapons and could provide food and clothing for himself and his family from natural materials around him. As he became more civilized, however, he began to want better shelter, more efficient tools and weapons, and more comfortable and more lasting clothing than could be provided by his own neighborhood or by the work of his own unskilled hands. For these things he had to turn to the skilled people such as smiths, leather workers or carpenters. It was then that the question of payment arose. At first he got what he wanted by a simple process of exchange. The smith who had not the time to look after land or cattle was glad to take meat or grain from the farmer in exchange for an axe or a plough . But as more and more goods which had no fixed exchange value came on the market, exchange became too complicated to be satisfactory. Another problem arose when those who made things wanted to get stocks of wood or leather, or iron, but had nothing to offer in exchange until their finished goods were ready. Thus the difficulties of exchange led by degree to the invention of money. In some countries easily handled things like seeds or shells were given a certain value and farmer, instead of paying the smith for a new axe by giving him some meat or grain, gave him so many shells. If the smith had any shells left when he had bought his food, he could get stocks of the raw materials of his trade. In some countries quite large things such as cows or camels or even big flat stones were used for trade. Later, pieces of metal, bearing values according to the rarity of the metal and the size of the pieces, or coins were used. Money as we know it had arrived. Exchange of goods became difficult because _ . A) man became more civilized B) there was not a marketplace for farmers and smiths to exchange their goods C) farmers hadn't enough grain or meat to provide for skilled workers D) more and more goods which had no fixed exchange values appeared on the market.
D
(Question)
An eighteen-year-old high school student from Utah won the top prize in the Intel Science Talent Search in the United States. The winner received a computer and a scholarship for a college education. More than 1,500students from across the country entered projects in the competition this year. Their research included chemistry, medicine, physics, mathematics, engineering, and computer science-almost every area of science. Forty students were invited to Washington, D.C. for the final judging. A group of scientists judged them on their research abilities, critical thinking skills and creativity. The judges also questioned the students about scientific problems before deciding on the winners. The top winner received 100,000 dollars for college. Shannon Babb of American Fork High School studied the water quality of tile Spanish Fork River in Utah for six years. She found that people have a harmful effect on the river through human activity, including agriculture. And she suggested ways to improve the water quality in the future. These include educating the public not to put household chemicals down the drains , which lead to the river eventually. Seventeen-year-old Yi Sun of the Hanker School in San Jose, California, earned the second place. He won a 75,000-dollar scholarship for new discoveries about a mathematical theory known as random walks. His work could help computer scientists and chemists. Yi Sun was born in China. The third-place winner was also seventeen and born in China. Yuan "Chelsea" Zhang of Montgomery Blair High School in Rockville, Maryland, won a 50,000-dollar scholarship. She researched the molecular genetics of heart disease. Her findings could aid the development of new medicines. The Intel Science Talent Search is the oldest science competition for high school students in the United States. It is 65 years old this year. Past winners have gone on to receive six Nobel prizes and other top honors in science and math. Where are you most likely to find this text? A) In a newspaper. B) In a handbook. C) In a textbook. D) In a medical magazine.
(Answer)
A
Ques: World Reading Day was set up by the UNESCO in 1995 to encourage people, especially teenagers, to discover the pleasure of reading. It is also the day to honor great writers, for example, William Shakespeare, born or dead on that day. Many countries celebrated World Reading Day. Take the UK as an example, on that day, millions of schoolchildren can buy book of special price, a much lower price than usual, in any bookstore. It has been done every year since 1998. World Reading Day 2010 in the UK will take place on Thursday 4th March. Please note that this date applies to the UK and Ireland only. The goal is so well set in schools there that they want to make sure that the Day happens in term time to really make the most of this opportunity to celebrate books and reading. Most other countries hold World Reading Day on 23 rd April every year. World Reading Day is also celebrated in China. Chinese former premier Wen Jiabao, an avid reader, does lots of reading every day though he is very busy. On World Reading Day 2009 he encouraged citizens to do more reading. Wen suggested that young people should spend more time reading. "Books cannot change the world, but people can change the world by changing themselves through reading." Reading can benefit people a lot. Reading helps us to follow the latest developments of science and technology. Reading gives us information about other cultures and places of the world. Reading is also one of the most important ways to learn a foreign language like English. "Reading makes a full man." (Bacon, 1597) Books, magazines, newspapers and other kinds of reading materials can help us to know more about the outside world and perfect us. Therefore, it is necessary for us to spend time on reading every day. Which of the following statements about World Reading Day is TURE? A) It was set up to encourage people to learn English. B) China also celebrates it on 4th March every year. C) It is also the same day as some great writers were born or dead. D) Only since 1998 has the UK begun to celebrate it.
Ans: C
Ques:An allergy is a strong reaction to a substance. Many things can cause allergies. The most common cause is pollen , which is usually produced by trees in the spring, grasses in the summer and weeds in the fall, as part of their reproductive process. Other causes include organisms, chemicals, plants and dead skin particles from dogs and cats can also cause allergic reactions. So can insect stings and some food. The most common kind of allergic reactions is itchy , watery eyes and a blocked or watery nose. Allergies can also cause red, itchy skin. Some reactions can be life-threatening, for example, when breathing passages become blocked. It is not always easy to avoid allergies. Drugs may offer an effective treatment. Another treatment used in some cases is called immunotherapy. A patient is injected with small amounts of the allergy-causing substance. The idea is that larger and larger amounts are given over time until the patient develops resistance in his body. In the United States, experts estimate that up to 8% of young children have food allergies. Every year these allergies cause about 30,000 cases with severe reactions that require immediate treatment. It can result in breathing trouble and in some cases death. It is said that about 100 to 200 people will die. It is said that most of the reactions are caused by peanuts and tree nuts like walnuts. People can also be allergic to medicines. The American Academy of Allergy, Asthma and Immunology says about 10% of bad reactions to commonly used medicines are allergic. In other words, a person's immune system overreacts and produces an allergic reaction. The most common reactions include skin rashes, itching, breathing problems and swelling in areas such as the face. The best title would be _ . A) The ABCs of Allergies B) The Cause of Allergies C) The Treatment of Allergies D) The Prevention of Allergies

Ans:
A