Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: It's hard to track the blue whale, which has almost been killed off by commercial whaling. Attaching radio devices to it is difficult and visual sightings are too unreliable to give real insight into its behavior. So biologists were delighted early this year when, with the help of the US Navy, they are able to track a particular blue whale for 43 days recording its sounds. This was possible because of the Navy's former top secret system of underwater listening devices across the oceans. Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies. Earth scientists announced at a news conference recently that they had used the system for closely observing a deep-sea volcanic eruption for the first time and that they planned similar studies. Other scientists have proposed to use the network for tracking ocean currents and measuring changes in the ocean and global temperatures. Different layers of ocean water can act as channels for sounds focusing them in the same way a stethoscope does when it carries faint noises from a patient's chest to a doctor's ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles. Options: A to trace and locate enemy ships B to observe deep sea volcanic eruptions C to study the movement of ocean currents D to replace the global radio communications network Answer: A to trace and locate enemy ships Question:

A: The underwater listening system was originally designed _ .

Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: Are you interested in country music? I like it very much! It will take me away for a while after I am tired .The guitars and songs will take me to mountains and fields. Country music usually talks of everyday life and feelings. It's the spirit of America, easy to understand, slow and simple. Country music developed in the Southern United States. It was the folk music of American countryside. Many of songs tell about the lives of farmers .They talk about love, crops or death. The life of the countryside can be hard, so the words in country music are often sad. At first, people played the music only at family parties. But it became more popular later. In the 1920s, people played country songs on the radio, and they made them into records. When people in the countryside moved to towns and cities to look for work, they took their music with them. Country music continued to change and became popular across America. John Denver was one of America's most famous country singers in the 1970s.His song "Take Me home, Country Roads" is well-known and people still play it today. Options: A A farmer in the countryside B A person who moved to towns C John Denver D John Denver's brother Answer: C John Denver Question:

A: Who is famous for the song "Take Me Home, Country Roads"?

Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: Argentina in the late nineteenth century was an exciting place.Around 1870,it was experiencing an economic boom,and the capital,Buenos Aires,attracted many people.Farmers,as well as a flood of foreigners from Spain and Italy,came to Buenos Aires seeking jobs.These jobs didn't pay well,and the people felt lonely and disappointed with their new life in the city.As the unhappy newcomers mixed together in the poor parts of the city,the dance known as the tango came into being. At the beginning the tango was a dance of the lower classes.It was danced in the bars and streets.At that time there were many fewer women than men,so if a man didn't want to be left out,his only choice was to dance with another man so that he could attract the attention of the few available women.Gradually,the dance spread into the upper classes of Argentinean society and became more respectable. In Europe at this time,strong interest in dance from around the world was beginning.This interest in international dance was especially evident in Paris.Every kind of dance from ballet to belly dancing could be found on the stages of the Paris theaters.After tango dancers from Argentina arrived in Europe,they began to draw the interest of the public as they performed their exciting dance in cafes.Though not everyone approved of the new dance,saying it was a little too shocking,the dance did find enough supporters to make it popular. The popularity of the tango continued to grow in many other parts of the world.Soldiers who returned to the United States from World War I brought the tango to North America.It reached Japan in 1926,and in 2003 the Argentinean embassy in Seoul hired a local tango dancer to act as a kind of dance ambassador,and promote tango dancing throughout South Korea. Options: A belly dancers B American soldiers C a Spanish city D the capital of Argentina Answer: D the capital of Argentina Question:

A: The origin of the tango is associated with _ .

Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: One person can make a difference -- purchase your copy of For America and discover simple ways to improve your life, your country, even the world. But a simple and attractive way to cut energy costs, improve air quality, and ensure public health is to grow a garden in the sky. Each time a city building is set up, the grass in that spot and trees that once reached up to the sky are replaced by a layer of asphalt or a tar roof . The lost green space can have a very real effect on a city's air temperature, air quality, and energy costs. On a summer day in most American cities, a tar roof can feel like the inside of an oven . But what if we could replace the hot roof of each skyscraper or building in a city with grass or a garden? Whether it holds vegetable gardens, wildflowers, or grasses, a green roof can lower the temperature above a building by 60 degrees, which can reduce the building's energy costs and, if used more widely, could decrease a city's total energy costs, and improve air quality and public health. But that's not all -- green roofs are a great way to handle water management in urban areas by taking in much rainfall, provide shelters for urban wildlife, and actually extend the life of the roof itself. And green roofs also do something else: they beautify the city -- whether you're on the 3rd floor or the 30th. Now that's a brilliant achievement. The non-profit group Earth Pledge is promoting a Green Roofs Program. To learn more about a green roof, just click here: EarthPledge.com. Options: A How to create a green roof. B The duty of the Earth Pledge. C The benefits of green roofs. D What to do with city pollution. Answer: A How to create a green roof. Question:

A:
What do you think the article will talk about if the passage continues?