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Read the following article and select the best answer. Article: Thick dust rose and a large building collapsed. This was the scene in Zhu Zhou,Hunan Province on May 17. Nine people were killed and 16 injured. Things were similar in the Sichuan earthquake. Thousands of people were buried in the ruins and lost their lives. What if we could have warned them? People are always _ to find a way of preventing buildings' collapse. Better materials and technology help,but they are not a solution. Just like humans,a building has its own life cycle from "birth" to "death".If we know when a building is going to collapse,we can repair it in advance or get out of it before it falls. Now,scientists at the University of Illinois have developed a material that turns red before it breaks. The invention could be used in things like climbing ropes or bridge supports. The research was led by Nancy Sottos,a professor at the university's Beckman Institute,and Douglas Davis,a graduate research assistant. The secret behind the color--changing material is a type of molecule .A molecule is a group of atoms held together by chemical bonds. Imagine you and your friends standing in a circle,holding hands. Each person stands for one atom,your hands represent the bonds,and the entire circle represents a molecule. If one person lets go of his or her hands,the molecule changes color. The research team put the molecule into a soft material. When the researchers stretched the material,it turned bright red for a few seconds before it broke into two pieces. When they repeatedly stretched and relaxed the material,without breaking it,it only turned a little red. The major problem is that light can get rid of the red color. When the team shone bright light on the molecule,the broken bond was fixed,and the color disappeared. Scientists have yet to do more research before the color--changing molecules can be used outside the lab. Question: What does the passage mainly introduce? - The collapse of a large building in Zhu Zhou, Hunan Province. - A type of molecule that can be put into a soft material - A material that turns red before it breaks. - A way of preventing building from collapsing.
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A material that turns red before it breaks.

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Read the following article and select the best answer. Article: Greece is one of the most beautiful countries of the world. Millions of tourists visit this place every year. In Greece the bus is the most convenient and preferred means of travelling. There are intercity buses operated by KTEL that interconnect various cities of Greece, and there are international buses operated by OSE that connect Greece to other European cities. Every tourist must visit Greece at least once in life. This country is really a vacation heaven. It is the perfect blend of history and art with adventure and romance. You can dive into deep blue waters, climb up the mountains or enjoy ancient architecture and history. Buses in Greece are cheap and very comfortable. All bus stations display schedules of buses on every route. Conductors and drivers are very polite and helpful. Travelers never face any trouble locating and boarding buses to their destinations. Tourists can always ask the conductor to inform them about their stop, so that they can get down at the right stop. Everyone here is more than happy to help tourists. Athens, the capital of Greece, has three bus terminals. Buses to different part of Greece leave from different terminals. Air-conditioned express buses also operated between major cities. They are faster and more comfortable than other buses. Tourists can choose guided Greece bus tour. These tours are the perfect way of exploring this great country. Buses in Greece are also a great way of saving _ on the journey. The long-distance bus system is very cheap. Buses save a lot of money to cover long distances, cheaper than taxis or cars. They are also the best means of interacting with local people. You can sit next to a native Greece and get some information about the place. Question: While taking long-distance buses, you can _ . - know more about the bus schedules - make friends with the conductors - learn more about bus systems in Greece - learn something about the place you're visiting
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learn something about the place you're visiting

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Read the following article and select the best answer. Article: Who's in control of your life? Who's pulling your strings ? For the majority of us, it's other people--society, colleagues, friends, family or our religious community. We learned this way of operating when we were very young, of course. We were brainwashed. We discovered that feeling important and feeling accepted was a nice experience and so we learned to do everything we could to make other people like us. As Oscar Wilde puts it, "Most people are other people. Their thoughts are someone else's opinions, their lives a mimicry , their passions a quotation." So when people tell us how wonderful we are, it makes us feel good. We long for this good feeling like a drug--we are addicted to it and seek it out wherever we can. Therefore, we are so eager for the approval of others that we live unhappy and limited lives, failing to do the things we really want to. Just as drug addicts and alcoholics live worsened lives to keep getting their fix , we worsen our own existence to get our own constant fix of approval. But, just as with any drug, there is a price to pay. The price of the approval drug is freedom--the freedom to be ourselves. The truth is that we cannot control what other people think. People have their own agenda , and they come with their own baggage and, in the end, they're more interested in themselves than in you. Furthermore, if we try to live by the opinions of others, we will build our life on sinking sand. Everyone has a different way of thinking, and people change their opinions all the time. The person who tries to please everyone will only end up getting exhausted and probably pleasing no one in the process. So how can we take back control? I think there's only one way--make a conscious decision to stop caring what other people think. We should guide ourselves by means of a set of values--not values imposed from the outside by others, but innate values which come from within. If we are driven by these values and not by the changing opinions and value systems of others, we will live a more... Question: It can be concluded from the passage that _ . - it's better to do what we like - we shouldn't care what others think - we shouldn't change our own opinions - it's important to accept others' opinions
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we shouldn't care what others think