input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: I have had all kinds of interesting neighbors since the early days of my life. When I was a baby I would stand in my wooden crib and watch the world go by through the window. Some neighbors watched me watching the world go by with by big, wondering eyes and found me very interesting. They used to call me "the beauty at the window". The early neighbors I could remember were from the second house I lived in. Peter and Paul were twins. We went to play school together although they were a year older than me. I well remember the Alsatian they had which ran into me when I was invited to their fifth birthday party. Needless to say, I was well-known for my loud screams after the party. But they said the pet was scared of my screams and didn't appear until the party was over. Peter and Paul were the first boys who encouraged me to climb the gate. I could never tell the difference between boy and girl behaviors--I just did what I thought was fun. Not only did I have a great time performing that first climb, I also got my skirts dirty, and was criticized by my mother. The Japanese neighbors I had living in this same house were my favorite, as they introduced me to sea-salt baked shrimps which were so crisp that you could eat the shrimp totally. They gave me some seaweed for my birthday. Thankfully, no other member in my family enjoyed the seaweed as I did. Perhaps what my mother used to joke to me was true, that I was picked up out of the dustbin that belonged to a Japanese home. Maybe sometimes it is difficult to find good neighbors in this society. But all it takes is a spark to get a fire going. I have decided to be that spark wherever I live and pass love on to my neighbors. Options: A a small child B an interesting toy C a dog D a bicycle Answer: C a dog Question:
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output: We can guess "the Alsatian" in the twin brothers' home is _ .

input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: A young father was visiting an old neighbor. They were standing in the old man's garden,and talking about children. The young man said,"How strict should parents be with their children?" The old man pointed to a string between a big strong tree and a thin young one."Please untie that string," he said.The young man untied it,and the young tree bent over to one side. "Now tie it again,please," said the old man,"but first pull the string tight so that the young tree is straight again." The young man did so.Then the old man said,"There,it is the same with children.You must be strict with them,but sometimes you must untie the string to know how they are getting on. If they are not yet able to stand alone,you must tie the string tight again.But when you find that they are ready to stand alone,you can take the string away." Options: A When the old man has left B After you have untied it C When the young man has untied it next time D When the young tree grows strong enough Answer: D When the young tree grows strong enough Question:
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output: When can the string be taken away? _ .

input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: It is believed that it took about 800 thousand to 1 million years for the earth's population to reach the 250 million total which existed at the end of the first century AD. For some time after that, disease, famine and war kept the population increase down to a rate of 1 percent a year so that more than 15 centuries passed before the population reached 500 million. But in the next 250 years, up to 1850, the population of the world shot to 1 billion and today it has reached 3.5 billion. Scientists say that in the next 35 years the population of the world will double, reaching almost 7 billion by the year 2010. When experts are asked what are the most effective measures that can stop over population, they reply that at least three measures can be considered. (A) Increasing sources and supply of food for under-developed countries. (B) Increasing the industrialization of under- developed countries. (C) Controlling birth. The experts add, however, that none of the above measures can be effective by itself, and that all must be combined into one whole program. They also agree that without controlling of births, any other measures are doomed to failure. Options: A 1850 and today B 100 and the year 1400 C 100 and the year 1600 D 1 and the year 100 Answer: C 100 and the year 1600 Question:
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output: The population of the world doubled between the year _ .

input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: It is an aerial performance far beyond the capabilities of even the most complex modern aircraft: landing upside down on a ceiling. But it is routine business for bats, and now scientists have learned precisely how they do it. Brown University scientists observed two species: Seba's short-tailed bat and the lesser dog-faced fruit bat. They tracked their motions using three high-speed video cameras taking images at 1,000 frames per second, and studied weight distribution in the bats' body and wings. They found that by flapping both wings while folding one of them just a bit toward their body, a bat can shift its centre of mass to perform a midair flip in order to land on a ceiling. "Flying animals all move skillfully constantly as they fly through a three-dimensional environment," Brown biology and engineering professor Sharon Swartz said. "Bats employ this specific technique every time they land, because for a bat, landing requires reorienting from head forward, back up, belly down, to head down, toes up." When approaching their touchdown spot, bats are not flying very quickly, making it difficult to gather the type of aerodynamic forces produced by pushing against the air that could help position them for an upside-down landing. But their heavy wings enable them instead to create inertial forces to adjust themselves in midair. Swartz said bats, as nocturnal animals, are generally not fully appreciated as skilled pilots. "People have many opportunities to observe birds and insects flying, but the bat world is hidden in the night. The more we observe flight behavior in bats, the more we are impressed," Swartz said. Options: A How bats hunt at night. B How bats land upside down. C How bats travel around at night. D How scientists track bats' motions. Answer: B How bats land upside down. Question:
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output:
What is the text mainly about?