Question: Steve Jobs, Apple's chief executive, made his first public appearance since going on medical leave six weeks ago, taking the stage at a San Francisco media event to introduce the iPad 2, the second generation of the company's tablet computer. Thin but energetic, Mr. Jobs showed off a thinner iPad. " We've been working on this product for a while and I just didn't want to miss this day," he said. His absence has concerned investors, especially since the group has given no details of his condition. He was diagnosed with cancer in 2004 and had a liver transplant during almost six moths of medical leave in 2009. People close to him said last month his health had been changing. Apple's stock rose more than 2 percent in the minutes after Mr. Jobs began speaking, then gave up some of its gain as he detailed the iPad 2. The iPad 2 will go on sale in black and white versions in the US on March 11 and in 26 other countries, including the UK and Germany, on March 25. The table is Apple's biggest product launch since the iPhone three years ago, and is comparable to the iPhone as the most expected in Apple's history. Most of the improvements in the latest version had been expected, including front and rear-facing video, which allows video conferencing between iPads, Mac computers and the most recent iPhones and iPods, a larger speaker, a faster processor and other upgrades. The iPad 2 is one-third thinner than the original tablet and slightly lighter, with a 9.7-inch touchscreen. It can run movies, books, games and a complete range of applications. In the US it will work with AT&T and Verizon, the top two mobile carriers. The pricing will be the same to the 2010 iPad at its introduction, ranging from $499 to $829 in six models. But Apple dropped prices on the older iPad on Wednesday by $100 across the board. Apple has made the most of its year-long head start in tablets, selling 15,000,000 units of the older iPad last year and taking about 85 percent of the market. Forrester predicted that the iPad 2 would clain 80... How many tablet computers were sold in the market last year? A) about 15,000,000 B) about 17,000,000 C) about 20,000,000 D) about 24,000,000
Answer: B

Question: During the 19th century, scientists found that when certain parts of the brain of a person were hurt, he would lose the power of doing certain things. And so people thought that each part of the brain does a different job. But modern research has discovered that this is not so, for it is not easy to show exactly what each part of the brain does. In the past fifty years there has been a great increase in the amount or research done on the brain. Scientists have found out that the way the brain works is not so simple as people in general may think. Chemists tell us that about 100,000 chemical changes take place in the brain every second. Some recent researches also suggest that we can remember everything that happened to us. We may not be able to think of the things we have heard and seen but it is kept there in the store-house of the human mind. Earlier scientists thought that the power of one's brain got weaker and weaker as one grows older. But it is plenty of exercise, it keeps its power. It is now thought that is not true. As long as the brain is given plenty of exercise, it keeps its power. It has proved that an old person who has always been active in the mind has a quicker mind than a young person who has done physical work without using much of his brain. Scientists today are still unable to show exactly   _  . A) what each part of the brain is doing B) how many chemical changes take place in the brain each second C) whether each part of the brain does the same job D) which part of the brain is the most important
Answer: A

Question: Children's lives have changed greatly over the last 50 years.But do they have a happier childhood than you or I did? It's difficult to look back on one's own childhood without some element of nostalgia .I have four brothers and sisters, and my memories are all about being with them.Playing board games on the living room floor, or spending days in the street with the other neighborhood children, racing up and down on our bikes, or exploring the nearby woods.My parents scarcely appear in these memories, except as providers either of meals or of severe blame after some particularly risky adventure. These days, in the UK at least, the nature of childhood has changed dramatically.Firstly, families are smaller, and there are far more only children.It is common for both parents to work outside the home and there is the feeling that there just isn't time to bring up a large family, or that no one could possibly afford to have more than one child.As a result, today's boys and girls spend much of their time alone.Another major change is that youngsters today tend to spend a huge amount of their free time at home, inside.More than anything this is due to the fact that parents worry far more than they used to about real or imagined dangers, so they wouldn't dream of letting their children play outside by themselves. Finally, the kind of toys children have and the way they play is totally different.Computer and video games have replaced the board games and more interesting activities of my childhood.The irony  is that so many ways of playing games are called "interactive".The fact that you can play electronic games on your own further increases the sense of loneliness felt by many young people today. Do these changes mean that children today have a less relaxing childhood than I had? I personally believe that they do, but perhaps every generation feels exactly the same. Which is NOT a reason for the changes? A) Families are smaller today B) Toys can be played by children alone at home C) It's too dangerous to play outside D) Parents worried too much about their children
Answer:
C