Problem: Write a multi-choice question for the following article, with the given choices and answer: Article: Imagine what you could do with a machine that could make things disappear. For inspiration, you could read some books. In the books of J.R.R. Tolkein, Bilbo Baggins finds a ring that can make him disappear. Of course, there's also poor Harry Potter, who used his invisibility cloak to hide from danger. Now that you've got some ideas, it's time for the hard part: building the cloak. To do that, you have to give up science fiction and turn to real science. An invisibility cloak has to cheat anything or anyone who might be watching. In order to understand how something can be seen, it's important to understand how we see. Human beings can only see objects that reflect light waves. These waves enter the eye and are then processed by the brain. However, if an object doesn't reflect light, then the waves don't enter the eye, and the brain doesn't process. So building an invisibility cloak is building something that doesn't reflect light. Cummer was part of a team of scientists from Duke University, including David Smith and David Schurig, who built the world's first version of an invisibility cloak. They had been inspired by the work of a British physicist, John Pendry. He in May said that an invisibility cloak was possible and Pendry was not the only one thinking about a disappearing act. At the same time, a Scottish physicist, UIf Leonhardt published a paper on building invisibility equipment. "It wasn't easy," says Cummer. "As often happens in science and research, it didn't work very well the first time. That first cloak didn't work like Harry Potter's --- the scientists didn't actually see anything disappear. So the research is still under way. " Options: A The Science of Disappearing B The Hardest Part of Building a Cloak C The Invention of an Invisibility Cloak D Turn Science Fiction into Real Science Answer: C The Invention of an Invisibility Cloak Question:

A: What can be the best title for the text?

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: American author Mark Twain once noted that "life would be surely happier if we could only be born at the age of 80 and gradually approach 18." Twain's words were only one of many complaints about aging. The ancient Greek poet Homer called old age "hateful", and William Shakespeare termed it "terrible winter". Alexander the Great, who conquered most of the known world before he died around 323 B.C., may have been looking for a river that healed the of age. During the 12th century A.D., a king called Prester John ruled a land that had a river of gold and a fountain of youth. But the name linked most closely to the search for a fountain of youth is 16th-century Spanish explorer Juan Ponce de Leon. He thought it would be found in Florida. In St. Augustine, the oldest city in the U.S., there's a tourist attraction. It is said to be the fountain of youth that Ponce de Leon discovered soon after he arrived in what is now Florida in 1513. However, elderly visitors who drink the spring's water don't turn into teenagers. But the tale of the search for a fountain of youth is so appealing that it survives anyway, says Ryan K. Smith, a professor of history. "People are more attracted by the story of looking and not finding than they are by the idea that the fountain might be out there somewhere." Still, a few grains of truth have helped to support . Kathleen Deagan, a professor of archaeology, says a graveyard and the remains of a Spanish mission dating back to St. Augustine's founding in 1565 have been discovered near the so-called fountain of youth. Michelle Reyna, a spokesperson for the Fountain of Youth Archaeological Park in St. Augustine, says the fountain has been a tourist attraction since at least 1901 and may have been attracting visitors since 1860. Options: A how the fountain of youth came into being B why some famous people hate becoming old C how to remain young forever D whether the fountain of youth exists Answer: D whether the fountain of youth exists Question:
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The answer is:
The passage mainly tells us _ .

[Q]: Write a multi-choice question for the following article, with the given choices and answer: Article: A TV grab shows anchorman Bai Yansong wearing a green tie on Oct 19, 2011. "I just want the students to know that I'm also wearing a green one. And we are all great people and are as good as those wearing red scarves." Bai Yansong, a famous anchor of China Central Television, voiced his support to students wearing green scarves at a primary school in Xi'an by wearing a green tie on a TV program, Oct 19, 2011. The program focused on a recent controversial issue, triggered by First Experimental Primary School in Northwestern China's Xi'an that made children whose schoolwork and general behavior were not yet good enough to wear green scarves instead of the red scarf of the Chinese Young Pioneers. "The original idea for designing the green scarf was to strengthen education and to encourage the pupils to work harder," said Chen Hong, the school's principal. The practice that divided students into "good" and "bad" has aroused a lot of discussions on Sina Weibo, a Chinese twitter-like microblogging website. The color1 of green in Chinese culture carries an annoying implication particularly because "green hats" are the Chinese symbol of a cuckold. Many Weibo users thought it was inappropriate to make pupils wear green scarves. "It is a violation of dignity to make bad students wear green scarves," said a blogger with the username Suosez. "If bad students have to wear green scarves, then bad teachers should wear green hats," another blogger said. "The Chinese version of Steve Jobs has died in primary school because his pride has been hurt by the green scarf," said another blogger. "It is an discrimination against children," said yet another. "Seeing the students in Xi'an wearing green scarves reminds me of some miserable memories. I cannot forget that I was the second group to wear a red scarf in my class. I cannot forget the scar on my hand left by my Chinese teacher.... Options: A Most of them are reminded of their miserable memories in the primary school. B Some of them think that green is a color1 standing for youth and energy. C Few of them can regard this practice as appropriate. D Some of Weibo users also decide to copy Bai Yansong's example to wear green ties. Answer: C Few of them can regard this practice as appropriate. Question:
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[A]:
What can we learn from the remarks of many Weibo users discussing this issue?