input: Please answer the following: Write a multi-choice question for the following article, with the given choices and answer: Article: Below is a selection from a popular science book. If blood is red, why are veins blue? Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it's outside the body, when it's sitting in a vein near the surface of the skin, it's more of a dark reddish purple colour. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison. Which works harder, your heart or your brain? This question depends on whether you're busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you're sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it. Do old people shrink as they age? Yes and no. Many people do get shorter as they age. But, when they do, it isn't because they're shrinking all over. They simply lose height as their spine becomes shorter and more curved due to disuse and the effects of gravity . Many (but not all) men and women do lose height as they get older. Men lose an average of 3-4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again?No, because old people don't really shrink!It is not that they are growing backwards--their legs, arms and backbones getting shorter. When they do get shorter, it's because the spine has shortened a little. Or, more often, become more bent and curved. Why does spinning make you dizzy ? Because your brain gets confused between what you're seeing and what you're feeling. The brain senses that you're spinning using special gravity and motion sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning , the system goes out... Options: A Their spine is in active use. B They are more easily affected by gravity. C They keep growing backwards. D Their spine becomes more bent. Answer: D Their spine becomes more bent. Question:
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output: Why do some old people look a little shrunken as they age?

Please answer this: Write a multi-choice question for the following article, with the given choices and answer: Article: What does the word iceberg make you think of ? Do you think of a large block of ice in a cold northern ocean? Or do you think of something that ships can crash into? While these are both correct, in truth there's far more to icebergs than meets the eye. According to scientists, only the largest blocks of ice count as icebergs. They must rise at least 5 meters above the water and be 15 meters wide at the water line. But only about 10 percent of an iceberg can be seen. The rest lie beneath the water. Icebergs begin froming when layers of snow fall year after year without melting. The snow is pressed together into large blocks of ice called glaciers. When chunks of ice break off these glaciers, icebergs are born. In Greenland alone, about 40,000 icebergs are formed each year. Since they began as snow, icebergs are made of fresh water, not salty ocean water. Tidy bubbles of air inside the ice give them their white color1. While most icebergs are white, some are blue because they have melted and frozen again. This action allows the air bubbles to escape. Other icebergs have brown, black or yellow parts because of dirt mixed with the ice. Algae can also get trapped in the underwater parts of an iceberg. If the iceberg turns over, all or part of it is green! Icebergs can be flat, cube-shaped, round like a turtle shell or U-shaped. Some even look like mountains. The large underwater parts of icebergs are hard for ships to avoid. They have destroyed and sunk many ships, including the Titanic. As a result, the International Ice Patrol now monitors icebergs in areas with heavy ship traffic. But there's yet another side to icebergs. Many microscopic animals live inside icebergs and in the water around them. These creatures feed on minerals that the icebergs store and release as they melt. Scientists are still studying all the ways icebergs affect sea life. Options: A Fresh water. B Salty ocean water. C Tiny bubbles of air. D The snow. Answer: C Tiny bubbles of air. Question:
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Answer: What makes most icebergs white?

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Even plants can run a fever, especially when they're under attack by insects or disease. But unlike human, plants can have their temperature taken from 3,000 feet away--straight up. A decade ago, adopting the infrared scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide spraying rather than rain poison on a whole field, which invariably includes plants that don't have pest problems. Even better, Paley's Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a colourcoded map showing where plants were running "fevers". Farmers could then spotspray, using 50 to 70 percent less pesticide than they otherwise would. The bad news is that Paley's company closed down in 1984, after only three years. Farmers resisted the new technology and longterm backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. "This technique can be used on 75 percent of agricultural land in the United States, " says George Oerther of Texas A & M. Ray Jackson, who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if Paley finds the financial backing which he failed to obtain 10 years ago. Options: A its high cost B the lack of official support C the lack of financial support D its failure to help increase production Answer: C the lack of financial support Question:???
output answer:
The application of infrared scanning technology to agriculture met with some difficulties-- _ .