*Question*
If you and your friends wish to share a secret, you can write it in code, and no one else will be able to read it. Codes are one way of writing in secret. Ciphers   are another. In a code each word is written as a secret code word or a code number. In a cipher each letter is changed. Codes and ciphers have played an important role in the history of the world. Julius Caesar, the Roman ruler who defeated almost all the countries in Europe about 2,000 years ago, used a cipher when he sent secret messages to his troops. During the American Revolution, George Washington's spies used a kind of code to send his information about the enemy before his military action. In World War II, the Americans"broke"or figured out Japan's most important navy codes and got enough information to destroy a powerful Japanese fleet. Storekeepers use codes to mark their goods. The codes show how much is paid for the goods or when they are added to the stock. Businessmen use codes to hide plans from their business enemies. Sometimes personal letters or diaries are written in code. Many people enjoy figuring out codes and ciphers simply as a hobby. In the 16th century, codes and ciphers were very popular among scientists. They wrote messages to each other in code so that no one else would learn their secrets. Geronimo Gardano, an Italian astrologer  , mathematician, and doctor, invented the trellis cipher. He took two sheets of paper and cut exactly the same holes in each one. Then he sent one sheet, which he called a trellis, to a friend and kept the other for himself. Whenever he wanted to write a message, he put his trellis over a clean sheet of paper and wrote the secret message through the holes. There he removed the trellis and filled the rest of the paper with words that would make sense. When his friend received it, he put his trellis over the writing and read the secret message. Which of the following statements is TRUE? A) Ciphers can be broken or figured out more easily than codes. B) You could read some words in Geronimo's letter without his trellis. C) The first person who ever used a cipher in history was Julius Caesar. D) Fondness of using codes was the hobby of the scientists in the 1600s.
**Answer**
B

*Question*
Today tell you a series of information about how students in other countries can attend colleges and universities in the United States. Two years ago we broadcast our Foreign Student Series. Since then we have got more requests for information about how to attend American schools. So we will offer new reports in our series with the most current information. Each week, we will discuss a part of the process of becoming an international student in the United States. Each report will also appear on the Internet at www. Tingroom.com. Currently you can find the programs from the last time our series aired. Foreign students who want to study in the United States have many questions. How do I find out about American colleges? How do I choose the right one for me? What tests must I take? What kinds of documents will I need? How much will it cost? We will answer these and other questions in our reports. We will discuss the American system of higher education. We will tell about financial aid and rules about working in jobs while a student. We will discuss required tests and explain English language requirements. And we will tell where to find help in other countries. Our reports will also describe a few of the three thousand colleges and universities in the United States. We will discuss programs of study as well as living situations at American schools. For students without the ability to come to the United States, we will tell how to take classes by computer. We will also examine how the threat of terrorism has changed some of the rules for study in the United States. In researching our series, we talked not only to officials in education and government, but also to some foreign students. Most students say planning ahead helped make their educational experience successful. That is the purpose of this series--to help you plan. We would like to hear from anyone who has a question about studying in the United States. We will try to answer as many questions as possible as part of our series in the coming weeks. Send your... The contents of the program include the following EXCEPT  _  . A) discussion about the educational system in America B) description about some colleges and universities in America C) help foreign students to plan D) teach how to use computer
**Answer**
D

*Question*
Walk through the Amazon rainforest today and you will find it steamy, warm, damp and thick. But if you had been there around 15,000 years ago, during the last ice age, would it have been the same? For more than 30 years, scientists have been arguing about how rainforests might have reacted to the cold, dry climate of the ice ages, but till now, no one has reached a satisfying answer. Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to solve global warming. Currently the trees in the Amazon take in around 500 million tons of CO2 each year: equal to the total amount of CO2 given off in the UK each year. But how will the Amazon react to the future climate change? If it gets drier, will it survive and continue to draw down CO2? Scientists hope that they will be able to learn in advance how the rainforest will manage in the future by understanding how rainforests reacted to climate change in the past. Unfortunately, collecting information is incredibly difficult. To study the past climate, scientists need to look at fossilized pollen kept in lake mud, Going back to the last ice age means drilling down into lake sediments , which requires specialized equipment and heavy machinery. There are very few roads and paths, or places to land helicopters and aeroplanes.  Rivers tend to be the easiest way to enter the forest, but this still leaves vast areas between the rivers completely unsampled . So far, only a handful of cores have been drilled that go back to the last ice age and none of them provide enough information to prove how the Amazon forest reacts to climate change. The best title for the text may be  _  . A) Secrets of the Rainforest B) Climates of the Amazon C) The History of the Rainforest D) Changes of the Rainforest
**Answer**

A