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

Q: Write a multi-choice question for the following article, with the given choices and answer: Article: Chrysanthemums are to the fall what tulips are to the spring. In ancient China, chrysanthemums (or 'mums' for short) were first planted thousands of years ago. People chose the chrysanthemum as their Flower for October, a symbol of the rest and ease that followed the season's final harvest. Then they symbolized a scholar in retirement and were one of the four noble plants, along with bamboo, the plum flower, and orchid. The Japanese hold the chrysanthemum as a symbol of the sun. They consider the orderly unfolding of its petals to be a symbol of perfection. They also think that a single chrysanthemum petal placed in the bottom of a wine glass encourages a long and healthy life. The Japanese even have a National Chrysanthemum Day on September 9, known as the Festival of Happiness. In the United States during colonial times, its popularity grew such that mums now reign as "Queen of the Fall Flowers." Mums remain the most widely grown pot plant in the country and the largest commercially produced flowers. Chrysanthemums generally represent cheerfulness and rest. So they are welcomed throughout the British Isles and North America for any occasion, such as football games and parties. In other countries such as Italy, Belgium and Austria, however, their association with the dead makes chrysanthemums acceptable only for funerals and graves. Options: A people like the flower just as they like the sun B the flower with its nice petals represents a symbol of perfection C people find the flower having no perfect petals when it is unfolding D the flower unfold its petals orderly just like the sun Answer: B the flower with its nice petals represents a symbol of perfection Question:
A: The Japanese consider the chrysanthemum as a symbol of the sun because _ .

Write a multi-choice question for the following article, with the given choices and answer: Article: If you travel to a new exhibition at the San Francisco Conservatory of Flowers, you will have chances to see some meat-eating plants. Take bladderworts, a kind of such plant, for example. They appear so small and grow in a quiet pond. "But these are the fastest known killers of the plant kingdom, able to capture a small insect in 1/50 of a second using a trap door!" Once the trap door closes on the victim, the enzymes similar to those in the human stomach slowly digest the insert. When dinner is over, the plant opens the trap door and is ready to trap again. Meat-eating plants grow mostly in wet areas with soil that doesn't offer much food nutrition. In such conditions, these amazing plants have developed insect traps to get their nutritional needs over thousands of years. North America has more such plants than any other continents. Generally speaking, the traps may have attractive appearance to fool the eye, like pitcher plants, which get their name because they look like beautiful pitchers full of nectar . Hair-like growths along the pitcher walls ensure that nothing can escape, and the digestive enzymes can get to work. A tiny insect can be digested in a few hours, but a fly takes a couple of days. Some of these pitchers are large enough to hold 7.5 liters. Meat-eating plants only eat people in science fiction movies, but sometimes a bird or other small animals will discover that a pitcher plant isn't a good place to get a drink. Options: A fooling insects into taking a sip B producing nectar C tempting insects to come close D enjoying a dinner Answer: D enjoying a dinner Question:
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Answer:
If the trap door of a meat-eating plant is closed, the plant is