In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

[Q]: Article: A green house is a building made of glass which is used for keeping warm when the outside temperature is low. In a similar way there are several gases in the atmosphere (mixture of gases that surround the earth) which trap the heat produced by the sun and prevent it from escaping. These gases are known as "greenhouse gases". And the way in which they trap heat in the atmosphere is called the "greenhouse effect". This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them the earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us. The problem is that in the last century and a half, we have been putting too many of these gases into the earth's atmosphere by burning large quantities of coal and oil and by cutting down forest. The rapid increase in greenhouse gases is making the world warmer. The world's temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide in the atmosphere doubles, there will probably be a rise in the earth's temperature of between I and 4degC;. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased.
Answer: a natural course that is to a certain degree useful to us
[A]: According to the passage, we can know "greenhouse effect" means _ .

[Q]: Article: Rosa Parks was an African-American woman who began the civil rights movement by refusing to give up her seat to a white person on a bus . She what she believed was right , and her courage inspired countless others to do the same. Born in Alabama in 1913 , Mrs. Parks grew up on a farm just outside Montgomery in a town called Pine Level . She was home-schooled until she was 11. She later attended the Industrial School for Girls in Montgomery. She briefly attended the Alabama State Teachers College for Negroes , but had to drop out to take care of her mother and grandmother when they became ill. Mrs. Parks married Raymond Parks in 1932 . He encouraged her to finish her education . This was very uncommon at that time , especially for a woman. Less than 7 percent of African-Americans studied in a high school in the 1930s. Mrs. Parks also succeeded in gaining the right to vote, which was very difficult for blacks under the segregation laws( ) . In 1943, she began working as a secretary for the NAACP----National Association for the Advancement of Colored People. Mrs. Parks made her historic decision on December 1,1955. She recalled in her autobiography : "When the driver saw me still sitting, he asked if I was going to stand up and I said , ' No, I'm not.' Then he said , ' Well , if you don't stand up , I'm going to have to call the police and have you arrested .' I said , ' You may do that.'" Mrs. Parks died on October 24,2005. " She sat down in order that we might stand up," said civil rights leaders Jesse Jackson. " Her imprisonment opened the doors for our long journey to freedom."
Answer: had no right at all
[A]: From the passage we can infer that in Rosa Parks' time black people _ .

[Q]: Article: In its early history, Chicago had floods frequently, especially in the spring, making the streets so muddy that people, horses, and carts got stuck. An old joke that was popular at the time went something like this: A man is stuck up to his waist in a muddy Chicago street. Asked if he needs help, he replies, "No, thanks. I've got a good horse under me." The city planner decided to build an underground drainage system, but there simply wasn't enough difference between the height of the ground level and the water level. The only two options were to lower the Chicago River or raise the city. An engineer named Ellis Chesbrough convinced me the city that it had no choice but to build the pipes above ground and then cover them with dirt. This raised the level of the city's streets by as much as 12 feet. This of course created a new problem: dirt practically buried the first floors of every building in Chicago. Building owners were faced with a choice: either change the first floors of their buildings into basements, and the second stories into main floors, or _ the entire buildings to meet the new street level. Small wood-frame buildings could be lifted fairly easily. But what about large, heavy structures like Tremont Hotel, which was a six-story brick building? That's where George Pullman came in. He had developed some house-moving skills successfully. To lift a big structure like the Tremont Hotel, Pullman would place thousands of jackscrews beneath the building's foundation. One man was assigned to operate each section of roughly 10 jackscrews. At Pullman's signal each man turned his jackscrew the same amount at the same time, thereby raising the building slowly and evenly. Astonishingly, the Tremont Hotel stay open during the entire operation, and many of its guests didn't even notice anything was happening. Some people like to say that every problem has a solution. But in Chicago's early history, every engineering solution seemed to create a new problem. Now that Chicago's waste water was draining efficiently into the Chicago River, the city's next step was to clean the polluted river.
Answer: Chicago's streets were extremely muddy
[A]:
The author mentions the joke to show _ .