Read the following article and select the best answer. Article: The journey two naval officers made some time ago to the very deepest point on the earth makes us realize how much of the world still remains to be explored. The two men went down seven miles to the bottom of the Pacific Ocean inside a small steel ball called a "bathyscaphe" to find out if there are any ocean currents or sings of life. It was necessary to set out early, so that the "bathyscaphe" would come to the surface in daylight, and so be easily found by the mother ship which would be waiting for it. The drivers began preparations at dawn and soon afterwards, when all was ready, the steel ball disappeared under the surface of the water. In time, the temperature dropped to freezing-point and the men trembled inside the ball. They kept in touch with the mother ship by telephone describing how they felt. Then, at a depth of 3,000 feet, the men were surprised by a sudden, loud noise, even the smallest hole in the ball would have meant instant death. Luckily, though, it was only one of the outer windows that had broken. Soon afterwards, the "bathyscaphe" touched the soft ocean floor raising a big cloud of "dust" made up of different kinds of small, dead sea animals. Here, powerful lights lit up the dark water and the men were surprised to see fish swimming just above them quite uncontrolled by the very large water-pressure. But they did not dare to leave the lights on for long, as the heat from them made the water boil. Quite unexpectedly, the telephone began working again and the weak but clear voices of the officers wre heard on the mother ship. After a stay of thirty minutes the men began their journey up, arriving three hours later, _ . Question: The officers started their journey at dawn _ . - because they could return in 24 hours - because the sea was calm then - when the sun was not strong - so that they could return before dark
so that they could return before dark

Read the following article and select the best answer. Article: Two men were sitting together in a plane. They were on a long journey. One of the men was a businessman. The other was a farmer. They sat without talking for a while, then the farmer said,"Let's do something to pass the time." "What do you want to do?" the businessman asked. "We can ask each other riddles." The farmer said,"You start.""Let's make the rules first," the businessman said. "That's not fair. You are a businessman with much knowledge. You know more things than I do. I am just a farmer." "That's true." The businessman said. "What do you want we should do?" "If you don't know the answer to a riddle, you pay me $100. And if I don't know the answer, I'll pay you $50." The farmer said. The businessman thought about this, then he said, "OK. That's fair. Who will go first?" "I will," The farmer said. "Here is my riddle. What has three legs when it walks, but only two legs when it flies?" The business man repeated the riddle, "What has three legs when it walks, but only two legs when it flies? Mm, that's a good one. I'm afraid I don't know the answer." He gave the farmer $100, then said, "Tell me the answer. What has three legs when it walks, but only two legs when it flies?""I don't know." The farmer said and gave him $50. Question: What does the word "riddle" mean in this story? - A difficult question to find the answer to. - Something to help to make rules. - Something to win money. - a kind of game on doing business.
A difficult question to find the answer to.

Q: Read the following article and select the best answer. Article: Lots of bacteria can grow in the seemingly unfriendly environment under glaciers , a region formerly considered free of much biology. This finding by glaciologists working in Switzerland could help solve some puzzles of the last ice age and point the way for finding life on other planets. Bacteria with odd lifestyles have been under increasing study lately, with most research focused on the species which prefer hot homes. The new study shifts attention to the other end of the thermometer . The exciting thing is the idea of pushing the window of acceptable bacterial environments a little bit farther open. Researchers have previously collected small numbers of bacteria from ice in Antarctica and Greenland, but they could not determine whether these were active bacteria or just frozen cells blown in by wind. In contrast, the earth beneath two Swiss glaciers harbors large colonies of bacteria--hundreds of millions of cells per gram--that appear to be growing at 0degC. Scientists followed upon these findings by taking samples of ice, water, and earth at two mountain glaciers. They found that earth beneath the glaciers contained much larger populations of bacteria than did surface and inner part of ice. Those findings indicate that the bacteria were growing at the bottom of the glacier and are not something washed in while the scientists drilled through the ice. Looking at the bacteria under a microscope , the researchers found that many were in the process of dividing, and healthy under the ice. The bacteria might break down minerals and plant remains originally buried beneath the glacier or later washed in by water going slowly through the ice, scientists say. "Some of the assumptions we have made in the past now must be seriously questioned," say researchers. "If bacteria can live under glaciers on Earth, why not on other planets? The new study points out in many ways that the bottoms of glaciers are probably quite good environments from the point of view of bacteria. So, maybe the bottom of the ice sheets on... Question: Which of the following facts proves that bacteria under glaciers are alive? - Water is going slowly through the ice. - The drills used by scientists are free of bacteria. - Many of the bacteria are in the process of dividing. - The earth beneath the glacier contains more bacteria.
A: Many of the bacteria are in the process of dividing.

Q: Read the following article and select the best answer. Article: "Any time! Any where! Decades ago there was no such thing" - "Communication". Then, September 7th 1987, the global system for mobile communication or GSM was born. And international agreements that laid out the standards, regulations and practices gave rise to a global mobile phone industry. To be honest, the world's first mobiles were not so attractive and the range of effectiveness wasn't very good. But they became a must-have among those wealthy people who could afford that. However, by advantage of GSM which has many different elements to it, we can all enjoy the ability to go around the world in 217 countries, land in that country and know that a phone would work. There are other cell phone systems using different technology in the world. The majority of the United States and parts of South America have been using something called CDMA which is very rare in Europe. In some Asian countries like China, GSM and CDMA both exist at the same time. But the GSM Association claims 85% of the global mobile phone market. They estimated there are now about 2.5 billion different users who make more than 7 trillion minutes of calls everyday, and that's not all. 20 years later, the mobile phone is so much more than just a phone. You can use it to send text messages, take pictures, show video, even surf the internet. "The phone itself is involved from just being a communication tool, to be a tool for round-the-clock connectivity, you can not live without it even in a minute." Mobile consultant Nick Lane also points out with so many customized styles and features, your mobile phone will become a symbol of you. Where will the global mobile phone industry be in another 20 years? Certainly, there will be more connections than better coverage. As for where else technology will take us, one can only imagine. Question: What does the writer feel about the GSM development in the following 20 years? - Satisfied. - Worried. - Confident. - Confused.
A: Confident.