input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: In 1620,about half the USA was covered by forests .Today the forests have almost gone .A lot of good land has gone with them ,leaving only sand .China doesn't want to copy the USA's example.We're planting more and more tress .We've built the "Great Green Wall "of tress across northern pat of our country .The "Great Green Wall"is 7,000 kilometers long ,and between 400 and 1,700 kilometers wide .It will stop the wind from blowing the earth away .It will stop the sand from moving towards the rich farmland in the south .More "Great Green Wall "are needed .Trees must be grown all over the world. "Great Green Wall "will make the world better . ,. Options: A sand B water C wind D forests Answer: D forests Question:
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output: A lot of good land has gone with _ .

input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: In the 1500s, South American fishermen said that the sea became warmer every few years. They gave this special event a Spanish name 'El Nino', meaning 'the baby'. It is called 'the baby' because it arrives around Christmas. El Nino is a huge area of warm water in the middle of cold water in the Pacific Ocean. It happens every two to seven years. It moves around the ocean and becomes bigger and smaller at different times. This warm water affects the weather. It is always raining over El Nino. El Nino contains a lot of energy. Scientists think this energy is formed when wind comes from the northern half of the world. The winds blow across warm sea water in the south. When the strong wind hits the warm water, violent weather happens. Scientists think that El Nino existed for many thousands of years. El Nino affects every person in the world because it affects the entire world's weather. It can bring the rain that farmers need. It can bring storms that destroy homes. It can mean that fishermen cannot catch fish, and it can bring floods. There is nothing we can do about El Nino. It is an event of nature. We can help the world's weather by trying to stop the greenhouse effect and air pollution. The most important job for scientists is to learn how to predict when El Nino is going to bring dangerous weather. Then, people can try to prepare for storms, floods and droughts. New technology like satellite pictures and temperature measuring equipment can help. Still, it is very hard to say when or where El Nino will cause damage. Options: A makes the weather better B affects the weather C gives the weather energy D predicts the weather Answer: B affects the weather Question:
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output: El Nino _ .

input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: On the first day of school, Jack found a little old lady with a warm smile."Hi, handsome. My name is Rose. I'm 87 years old."she said. "Why are you in university at such a YOUNG age?" Jack asked. "I'm here to meet a rich husband, get married, have a couple of kids, and then retired and travel." she answered. Jack knew she's joking but he was surprised what encouraged her to be here at her age. "I always dreamed of having a university education and now I'm getting one!" she told me. We became friends. Every day they would talk after class. Jack always enjoyed listening to this "time machine" as she shared her wisdom and experience with him. And Rose easily made friends wherever she went. At the end of the term, Rose was invited to make a little speech. She said, "We don't stop playing because we're old. We grow old because we stop playing. Being happy and achieving success may keep you staying young. If you have a dream, hold on. When you lose your dreams, you die." "Anybody can grow older. _ doesn't take any talent or ability. The idea is to grow up by always finding the chance in change..." Options: A meet a rich husband B make new friends C get a better job D get a university education Answer: D get a university education Question:
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output: Rose went to the university in order to _ .

input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: Carbon monoxide poisoning causes death and injuries around the world. This gas is a problem in all parts of the world that experience cold weather. A few years ago, America's Centers for Disease Control (C. D. C.) studied deaths linked with carbon monoxide poisoning. It found that the number of carbon monoxide deaths in the United States was greatest in January. The C.D.C. also found that carbon monoxide kills more than four hundred Americans each year. And, it said more than twenty thousand people are taken to hospital for treatment of health problems linked with the gas. Carbon monoxide is called the silent killer because people do not know it is in the air. The gas has no color, no taste and no smell. It does not cause burning eyes. And it does not cause people to cough. Yet, carbon monoxide gas is very deadly . It steals the body's ability to use oxygen. Carbon monoxide makes it difficult for the blood to carry oxygen to body tissues . It does this by linking with the blood. When the gas links with the blood, the blood is no longer able to carry oxygen to the tissues that need it. Damage to the body can begin very quickly from large amounts of carbon monoxide. How quickly this can happen depend on how long a person is breathing the gas and how much gas he or she breathes in. Carbon monoxide poisoning has warning signs . But people have to be awake to realize them. Small amounts of the gas will cause a person's head to hurt. He or she may begin to feel tired. Their stomachs may feel sick. The room may appear to be turning around. The person may have trouble thinking clearly. People develop serious headache as the amount of the gas continues to enter their blood. They will begin to feel very tired and sleepy. They may have terrible stomachache. Doctors say carbon monoxide influences people differently. For example a small child will experience health problems or die much sooner than an adult. The general health of the person or his or her age can also be important. Options: A Warning signs that carbon monoxide poisoning has. B Reasons why carbon monoxide can cause person's death. C The damage of carbon monoxide and how it works. D Influences of carbon monoxide on children and adults. Answer: C The damage of carbon monoxide and how it works. Question:
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output:
What does the passage mainly talk about?