instruction:
In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.
question:
Article: One summer night Ludwig Beethoven took a walk in the suburb of Bonn. Suddenly a gentle wind came. He heard some music. He listened carefully and found it was his F sonata. He followed the music and came to a small house. There through the window, he saw a girl playing a very old piano and a young man was making shoes beside her, he pushed the door open and went in. The host received him very warmly and told him that the girl was his sister, who was blind but very fond of music. They couldn't afford to send her to a master. So she was only trying to play some music she heard the neighbors play. She knew it was the work of a great composer. Beethoven was very much moved. Suddenly the candle was blown out. Moonlight struck on the girl's slender figure. Then Beethoven played music for them. He played so wonderful that the brother and sister were amazed. That was his famous Clair de lune.
Question: Beethoven heard the music because _ .
Options: (A) it was played loudly (B) there was a slight wind (C) the piano was old (D) he stopped walking
answer:
B

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Article: Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity . In very cold climates, there is a constant danger of developing hypothermia , which is a life threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0degC. However, differences in persons and even the time of day can cause it to be as much as 6degC higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4degC. Below 29.4degC, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6degC. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7degC. In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7degC. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.
Question: Why can humans keep stable body temperatures in different seasons?
Options: (A) Because their bodies are unusually efficient. (B) Because they experience different climates. (C) Because they can adjust to cultural patterns and technologies. (D) Because they have internal temperature regulating systems.
answer:
D

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Article: Honesty is the best policy, as the English saying goes. Unfortunately, honesty often leaves us when no one is watching, British psychologists reported last week. Researchers at UK's Newcastle University set up an experiment in their psychology department's coffee room. They set a kettle, with tea, coffee and milk on the counter and hung up a sign listing the price for drinks. People helping themselves to a cup of tea were supposed to put a few cents in the box nearby. The scientists hung a poster above the money box, and changed each week between pictures of gazing eyes and pictures of flowers. The researchers found that staff paid 2.76 times more for their drinks when the image of the eyes was hung. "We were shocked by the size of the effect," said Gilbert Roberts, one of the researchers. Eyes are known to be a powerful perceptual signal for humans, scientists say. "Even though the eyes were not real, they still seemed to make people behave more honestly," said Melissa Bateson, a behavioral biologist and leader of the study. Researchers believe the effect throws light on our evolutionary past. It may arise from behavioral characteristics that developed when early humans formed social groups to strengthen their chances of survival. For social groups to work, individuals had to co-operate, rather than act selfishly. "There's an argument that if nobody is watching us, it is in our interests to behave selfishly. But when we're being watched we should behave better. So people see us as co-operative and behave the same way towards us," Bateson said. The new finding indicates that people have a striking response to eyes. That might be because eyes and faces send a strong biological signal we have evolved to respond to, Bateson said. The finding could be put to practical use. For example, images of eyes could ensure ticket sales on public transport and improve surveillance systems to deter anti-social behavior.
Question: In the experiment, a poster was hung above the money box to _ .
Options: (A) give a harmonious atmosphere (B) remind people the drinks were not free (C) prove the actual effect of different pictures (D) see how honest people are in different situations
answer:
D