Read the following article and answer the question. Article: Have you ever thought about seeing the world for free? Although it may sound impossible, there's a growing community that is making that dream one step closer. The community is called Couchsurfing. The idea is that people open their homes up to travelers for free, and in exchange both people will learn from each other. Instead of paying a lot of money staying in hotels, living with locals is both cheap and authentic . Maybe you'll find a hidden attraction in the city. It may be a good place where people like to visit. This is also your chance to ask what life in their country is really like. It also works as a culture exchange. For example,if you play the guitar and your host is a great cook, teach him or her how to play to say thank you for the dinner. This type of exchange is popular. But what are some manners of being a good Couchsurfer? First, be careful about cultural taboos . For example, if you eat with Indians, never use your left hand. In Indian culture, left hands are used for the toilet. Also, when you are going to leave, it's a good idea to prepare a small gift. This shows your _ to the home owner. Now, are you ready to travel like a local? Where will you surf first? Question: According to the passage, what's the Couchsurfing? Answer:
OPTIONS:
- A travel way to offer the travelers their homes for free.
- Offer food to the travelers for free.
- Show some places of interest for free.
- Take the travelers to some places in the city for free.

Answer: A travel way to offer the travelers their homes for free.

Read the following article and answer the question. Article: Geography is the study of Earth and its climates. Scientists use it to study global warming and track the weather. Governments use it to learn where people live and work and to plan what to do with the land. It is now easier than ever to use geography because of a science called space technology. The United States launched its first satellite in 1958. Some space missions that followed were geographical studies. In fact, earth science is a big part of the work of the National Aeronautics and Space Administration (NASA). Astronauts looked out of the space shuttle. They decided to take photographs of Earth from their vantage point. Over the years, picture quality improved. Shuttle photography now shows land features, such as rivers. It can even show the streets of large cities. Photos of the same places at different times show how the land is changing. NASA does not use just photographs, though. In 1958 it launched TIROS (the Television Infrared Observation Satellite). This first use of a satellite to study Earth was effective in giving weather forecasts. It led to the creation of new space tools to use in geography. The Landsat Program began in 1972. This satellite sent detailed views of Earth from space. The pictures were so precise that scientists could count the number and kinds of crops in a field. Landsat showed where Earth's surface had faults along which earthquakes might happen. This information helped in the planning of new cities and factories. Landsat also made discoveries. In Antarctica it located ranges of unknown mountains. It pinpointed small lakes in Virginia that were no ton maps. Landsat, now more advanced, still flies today. Another space tool is Earth Observing-1 (EO-1). This spacecraft flies right behind Landsat. It takes pictures of the same sites. The two sets of pictures, viewed together, show how cities grow and how other places, such as rain forests, become smaller over time. This helps scientists learn how people affect geography. One of the newest space tools is the Geographical... Question: Which of the following is true according to the passage? Answer:
OPTIONS:
- The U.S. satellite program began in 1972.
- Landsat was able to take pictures of other planets.
- TIROS was successful in giving weather forecasts.
- GIS can only be used by the government.

Answer: TIROS was successful in giving weather forecasts.

Read the following article and answer the question. Article: The world is not only hungry but also thirsty for water. This may seem strange to you, since nearly 70% of the earth's surface is covered with water. But about 97% of that is sea water or salt water. Man can only drink and use the other 3% of fresh water from rivers, lakes, underground and so on. And we can not even use all of that because some of it has been made dirty. Earth Day is April 22. But on all other days, we must also remember how important water is. The water that we use is the most important natural resource on the earth. Today we face serious water problems. One of them is water pollution. All kinds of things from cars, factories, farms and homes make our rivers, lakes and oceans dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish, too. How do cars and factories make our water dirty? First they pollute the air. Then when it rains, the rain water makes our drinking water dirty. Dirty rain, called acid rain is also bad for plants, animals and buildings. Scientists say that in 30 years, more than half of the people in the world won't have enough clean water. We have to learn how to stop wasting water. One of the first steps is to develop ways of reusing it. Today in most large cities, water is used only once and then sent out into a sewer system . From there it returns to the sea or goes underground. But even though every large city reused its water, we would still not have enough. So we should make use of sea water by removing the salt in it. If we can take these steps, fresh water won't be used up. Question: The world is thirsty for water because _ . Answer:
OPTIONS:
- we don't have enough fresh water
- a lot of water goes into sewer systems
- only 70% of the earth's surface is water
- sea water is widely used rather than fresh water

Answer:
we don't have enough fresh water