Read the following article and select the best answer. Article: The rapid growth of cities worldwide over the next two decades will cause significant risks to people and the global environment, according to analysis. Researches from Yale and Stanford predict that by 2030 urban areas will expand by 590,000 square miles--nearly the size of Mongolia--to meet the needs of 1.47 billion more people living in urban areas. "It is likely that these cities are going to be developed in places that are the most biologically diverse," said Karen Seto, a famous scientist at Yale University. "They are going to be growing and expanding into forests, biological hotspots, savannas , coastlines--sensitive and _ places." Urban areas, they found, have been expanding more rapidly along coasts. "Of all the places for cities to grow, coasts are the most sensitive. People and buildings along the coast are at risk of flooding and other environmental disasters," said Seto. The study provides the first estimate of how fast urban areas globally are growing and how fast they may grow in the future. "We know a lot about global patterns of urban population growth, but we know significantly less about how urban areas are changing," she said. "Changes in land cover associated with urbanization lead to many environmental changes, from habitats loss and agricultural land conversion to changes in local and regional climate." The researchers examined studies that used satellite data to map urban growth and found that from 1970 to 2000 the world's urban footprint had grown by at least 22,400 square miles--half the size of Ohio. "This number is numerous, but, in actuality, urban land expansion has been far greater than what our analysis shows because we only looked at the published studies that used satellite data," said Seto. "We found that 48 of the most populated urban areas have been studied using satellite data, with findings in journals. This means that we're not tracking the physical expansion of more than half of the world's largest cities." Half of urban land expansion in China is driven by a rising... Question: Cities in Africa become bigger and bigger mainly because of their _ . - growing population - rising middle class - unique living patterns - economic development
growing population

Read the following article and select the best answer. Article: Have you ever seen a 250-mile-wide bath sponge? Well, take a look at Hyperion, one of Saturn's moons. Recent photos of the hamburger-shaped moon reveal a strange world covered with large and small craters . The photos were taken by high-tech cameras aboard the spacecraft Cassini, which has been exploring Saturn and its moons since 2004. Scientists studying the photos have recently identified something surprising: dark and reddish material on Hyperion's surface. They believe that the substance may be organic material, including combinations of the chemical elements hydrogen and carbon. That's important because all life, including human life, is built from organic building blocks. "Organic material is the key to understanding life in the solar system. When we try to understand how life formed on Earth and whether life could form on other planets, this is one of the things we look at," says Dr. Amanda Hendrix. She is a planetary scientist who works on the Cassini project. So how did such material get on a lifeless moon circling Saturn? Scientists suspect it was deposited by meteors . "Craters on Hyperion are the result of meteoroid impact," said Dr. Hendrix. "A meteoroid is the leftover material from the formation of planets." The largest crater on Hyperion is 75 miles across and 6 miles deep! But even though Hyperion looks like a sponge, it most likely doesn't feel like one. Cassini has found that the moon is made mainly of ice. Cassini may give scientists many more surprises. It is scheduled to orbit Saturn until next year, but NASA scientists also hope to extend the spacecraft's mission until 2010. Unlike Earth, which has only one moon, Saturn has 48 moons. The extra two years will give scientists an opportunity to learn more about Saturn's many moons. "This mission not only has given us a lot of answers but also has posed a lot of new questions," says Hendrix. Question: Why are scientists interested in organic material in space? - Because it appears on Hyperion which forms building blocks. - Because it combines the chemical elements hydrogen and carbon. - Because it is dark and reddish material on Hyperion's surface. - Because it can help scientists to understand the origin of life.
Because it can help scientists to understand the origin of life.

Q: Read the following article and select the best answer. Article: Ma Weidu is the founder and curator of Guanfu Museum, which is the first private museum in China. With mainly Chinese artifacts on exhibition, the museum was founded on Jan. 18,l 997.It was not well-known by the public until 2008. On Jan. l,2008,Ma Weidu was invited to be the guest in the flagship CCTV program "Lecture Room". He talked about his museum and more importantly, he introduced Chinese artifacts and their underlying historical, cultural significance. In 2009,Ma Weidu initiated Beijing Guanfu Cultural Foundation. Creating a culture foundation had been Ma's dream for many years. Beijing Guanfu Cultural Foundation is committed to spreading Chinese traditional culture, funding the development of Guanfu Museum, heritage research and conservation projects, building a platform for public culture, promoting and guiding the public in the spirit of "charity&culture sponsorship ". Guanfu Museum is currently located at No.18 Jinnan Road, Zhangwanfen, Dashanzi, Chaoyang district, Beijing. But due to the city planning, it has to move. Guanfu Museum, which has experienced relocation for three times, is now looking for a new place. According to Mr. Ma, it should be around 20,000-30,000 square meters. Question: According to this passage, which of the followings is true? - Guanfu Museum was built in 2008. - Ma Weidu was invited to lecture by Guanfu Museum. - The public were attracted by Chinese artifacts on exhibition. - Guanfu Museum, the first private museum in China was founded fifteen years ago.
A: Guanfu Museum, the first private museum in China was founded fifteen years ago.

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Read the following article and select the best answer. Article: DoSomething.org is the country's largest non-profit organization for young people and social change. They provide some scholarships to reward teens who are social action leaders in their community. You may be interested in the following ones. 1. $2,000 Fight Climate Change like a Ninja Scholarship Ninjas release 86% less CO2 than the average person. Why? Because ninjas use a green form of transport ---- parkour . DoSomething.org wants to teach you their ways of going green---- and offer the chance for a $2,000 scholarship. Submit one of your friends' phone numbers. You'll both receive a text message with ways to protect the planet, and you'll be entered for the scholarship. Bonzail! 2. $3,000 Puppy Mills are Bad Scholarship Use your phone to fight for millions of puppies born in abusive factory farms. Share a text messaging game on puppy mills with 6 friends and you'll be entered to win a $3000 scholarship. Millions of puppies are born in horrible conditions each year, so puppy mills can make a profit. Invite your friends to step into the shoes of a pet store employee who discovers their store supports puppy mills. To enter for the $3,000 scholarship, visit www. Dosomething.org/puppy and submit six friends' phone numbers. 3. $5,000 Safe Driving Scholarship When you text while driving at 55 mph, your eyes go off the road for the length of an entire football field. Tell your friends about the danger of texting while driving to enter to win a $5000 scholarship. After entering, we'll send you a free pair of "thumb socks" ---- a physical reminder to stop texting while driving. Send us a picture of you with your thumb socks and you'll double your chance of winning the $5,000 scholarship. Question: What do the scholarships mentioned in the passage have in common? - They are provided by DoSomething.org. - They offer a small gift to every attendant. - They require attendants to be top students. - They require attendants to play a message game.
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They are provided by DoSomething.org.