In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
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Question: Article: Scientists are closely concerned with the structure of buildings and with the quality of building materials. The World health Organization (WHO) observes that the introduction of air conditioning and energy conservation measures have been accompanied by growing problems of indoor air quality. Some pollutants arise from insulation products, some from moving cars, and others from modern housing materials. As many Europeans spend up to 90% of their lives in buildings, the health effects of the indoor climate are very important. Some construction materials, including fiberboard, insulation foams and certain glues for man-made wood floor boards, for example, give out organic products such as formaldehyde . Heat and humidity increase the release of formaldehyde and the gas seriously harms the eyes. Paint, lacquer, etc. can also release dangerous gas into indoor air. Construction materials can cause serious damage, especially when they contain asbestos . Asbestos is naturally present in rock formations worldwide. It belongs to a family of mineral substances made up of solid, non-combustible fiber. These properties make asbestos a highly sought-after construction material. As early as 1931, however, public health officers in the prefix = st1 /United Kingdomrevealed the connection between breathing in asbestos dust and such diseases as lung cancer. The land on which a building is sited may also contribute to pollution. Some kinds of granite or similar rocks contain traces of radium. As it breaks down, this naturally radioactive element produces some kind of radioactive gas that goes through tiny cracks in walls, floors and building materials, and makes its way into the building and the rooms. The better the homes are insulated, the more is the dangerous gas in indoor air. The main effect of this dangerous gas on health is to increase the risk of lung cancer.
Answer: Some factors cause indoor air pollution.

Answer: What is the main idea of the passage?

Question: Article: Horror seized the heart of the World War I soldier as he saw his life-long friend fall in the battle. Caught in a trench with continuous gunfire whizzing over his head, the soldier asked his commander if he might go out into the "No Man's Land" between the trenches to bring his fallen comrade back. "You can go," said the commander, "but I don't think it will be worth it. Your friend is probably dead and you may throw your own life away." The commander's words didn't matter, and the soldier went anyway. To one's surprise, he managed to reach his friend, raised him onto his shoulder, and brought him back to their company's trench. As the two of them fell in together to the bottom of the trench, the officer checked the wounded soldier, and then looked kindly at his friend. "I told you it wouldn't be worth it," he said. "Your friend is dead, and your wound is deadly." "It was worth it, though, sir." the soldier said. "How do you mean 'worth it'?" responded the commander. "Your friend is dead!" "Yes sir." the soldier answered. "But it was worth it because when I got to him, he was still alive, and I had the satisfaction of hearing him say, 'Jim, I knew you'd come.'" Many a time in life, whether a thing is worth doing or not really depends on how you look at it. Take up all your courage and do something your heart tells you to do so that you may not regret not doing it later in life.
Answer: Negative.

Answer: What's the commander's attitude towards the soldier's saving his friend?

Question: Article: Three men were travelling across the desert when their car broke down. There were no other traffics, so their only hope was to walk. Before they set off, they looked around in the car for useful things to take with them. One of the men took a bottle of whisky. Another took an umbrella. The third unscrewed a door from the car and carried that. After they had been walking for almost a day, they came across a camel caravan travelling towards them. "Let's try to join the caravan," one of the men said. "It's going the wrong way but we'll be safer than if we keep on alone across the desert." The other s agreed, so they asked the leader of the caravan for permission to join it. "You can join the caravan only if you answer three questions," he said. He pointed to the first man's bottle. "What is that and why are you carrying it?" he asked. "It's a bottle of whisky. I decided to carry it with me so that if I feel miserable and want to give up, I can get drunk, cheer myself up and then keep on walking." "Very sensible," the leader of the caravan said. Then he pointed to the next man and his umbrella. "It hasn't rained in the desert for many years," he said. "Why are you carrying an umbrella?" "I don't want to get heat exhaustion," he replied. "The umbrella will give me shade from the sun." "Very sensible," the leader of the caravan said. He pointed to the third man and his car door. "And why are you carrying a car door?" he asked him. "I thought that if I got too hot I could open the window and let some air in," he explained.
Answer: They exchanged it for another one.

Answer:
What happened to the three men's car?