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Read the following article and select the best answer. Article: When her five daughters were young, Helene An always told them that there was strength in unity .To show this, she pick up one chopstick, taking it as one person.Then she easily broke it into two pieces.Next, she tied several chopsticks together, taking them as a family.She showed the girls it was hard to break the tied chopsticks.This lesson about family unity stayed with the daughters as they grew up Helene An and her family own a large restaurant business in California.However, when Helene and her husband Danny left their home in Vietnam in 1975, they didn't have much money.They moved their family to San Francisco.There they joined Danny's mother, Diana, who owned a small Italian sandwich shop.Soon afterwards, Helene and Diana changed the sandwich shop into a small Vietnamese restaurant.The five daughters helped in the restaurant when they were young.However, Helene did not want her daughters to always work in the family business because she thought it was too hard. Eventually the girls all graduated from college and went away to work for themselves, but one by one, the daughters returned to work in the family business.They opened new restaurants in San Francisco and Los Angeles.Even though family members sometimes disagreed with each other, they worked together to make the business successful.Daughter Elisabeth explains, "Our mother taught us that to succeed we must have unity, and to have unity we must have peace.Without the strength of the family, there is no business." With three generations of Ans working together, now the Ans'business makes more than $20 million each year.Although they began with a small restaurant, they had big dreams, and they worked together.Now they are a big success. Question: Helene once used chopsticks to show _ - the quality of the chopsticks - the difficulty of being united - the strength of family unity - how to be a strong person
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the strength of family unity

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Read the following article and select the best answer. Article: The United Kingdom of Great Britain and Northern Ireland is the eleventh largest nation in Europe. England, Wales and Scotland make up the island of Great Britain, which takes up most of the Britain Isles. Northern Ireland, Scotland and Wales are mountainous. The highest mountain is Ben Nevis in Scotland. Plains and valleys cover much of England. The British climate is mild. About 58 million people live in the United Kingdom. Few other countries are so crowded. Four out of five people live in cities such as Belfast, Glasgow, and London. London is the capital. Great Britain grows half of the food it needs. Its industries help to pay for the food that is bought from abroad. The United Kingdom manufactures a wide range of goods. Service industries, such as tourism, that provide services rather than producing goods, are increasing. Traditional industries, such as coal mining, are declining. Question: In the United Kingdom, about _ people live in big cities. - 58 million - 46 million - 38.8 million - half
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46 million

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Read the following article and select the best answer. Article: What do the common cold, the flu, and AIDS have in common? They are all diseases caused by viruses, tiny microorganisms that can pass from person to person. It is no wonder that when most people think about viruses, finding ways to _ them is what is on people's minds. Not everyone runs from the tiny disease carriers, though. In Cambridge, Massachusetts, scientists have discovered that some viruses can be helpful in an unusual way. They are putting viruses to work, teaching them of the world's smallest rechargeable batteries. Viruses and batteries may seem like an unusual pair, but they are not so strange for engineer Angela Belcher, who first came up with idea. At the Massachusetts Institute of Technology in Cambridge, she and her team bring together different areas of science in new ways. In the case of the virus-built batteries, the scientists combine what they know about biology, technology and production techniques. Belcher's team includes Paula Hammond, who helps put together the tiny batteries, and Yet-Ming Chiang, an expert on how to store energy in the form of a battery. Many batteries are already pretty small. However, every year, new electronic devices like personal music players or cellphones get smaller than the year before. As these devices become smaller, ordinary batteries won't be small enough to fit inside. The ideal battery will store a lot more energy in a smaller package than ordinary batteries. Right now, Belcher's model battery, a metallic disk completely built by viruses, looks like a regular watch battery. But inside, its parts are very small--- so tiny that you can only see them with a powerful microscope. How small are these battery parts? To get some idea of the size, pluck one hair from your head. Place your hair on a piece of white paper and try to see how wide your hair is--- pretty thin, right? Although the width of each person's hair is a bit different, you could probably fit about 10 of these virus--- built battery parts, side by side, across one hair. These... Question: What is the passage mainly about? - Diseases caused by viruses. - An engineer called Angela Belcher. - Batteries built by viruses. - Rechargeable batteries.
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Batteries built by viruses.