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: Gwendolyn Brooks wrote hundreds of poems during her lifetime. She was known around the world for using poetry to increase understanding of black culture in America. During the 1940's and the 1950's, Gwendolyn Brooks used her poems to describe conditions among the poor,racial inequality and drug use in the black community. She also wrote poems about the struggles of black women. But her skill was more than her ability to write about struggling black people. She combined traditional European poetry styles with the African American experience. Gwendolyn Brooks once said that she wrote about what she saw and heard in the street. She said she found most of her materials through looking out of the window of her second-floor apartment in Chicago, Illinois. In her early poetry, Gwendolyn Brooks wrote about the South Side of Chicago, where many black people live. In her poems, the South Side is called Bronzeville. It was "A Street in Bronzeville" that gained the attention of literary experts in 1945. Critics praised her poetic skills and her powerful descriptions about the black experience during the time. The Bronzeville poems were her first published collection. In 1950, Gwendolyn Brooks became the first African American to win the Pulitzer Prize for Literature. She won the prize for her second book of poems called "Annie Allen". "Annie Allen" is a collection of poetry about a Bronzeville girl as a daughter, a wife and a mother. She experiences loneliness, loss, death andpoverty . Gwendolyn Brooks said that winning the prize changed her life. Her next work was a novel written in 1953 called "Maud Martha". "Maud Martha" attracted little attention when it was first published. But now it is considered an important work by some critics. Its main ideas about the difficult lives of many women are popular among female writers today.
Answer: she introduced black culture by writing poems
[A]: Gwendolyn Brooks became world-famous because _ .

[Q]: Article: Dear Mom, Clear My Calendar September is around the corner, and some of us are already complaining about summer's end. But parents have a special reason to do so. The end of summer means the start of school. And these days, planning a young child's schedule is a big challenge. The challenge is no longer finding activities to fill a child's day; it is saying no to the hundreds of options available. Our mailbox is filled with brochures urging us to sign our kids up for classes from cooking to martial arts . Educators are themselves discouraged by the number of special classes that many children attend. In the name of "enrichment," three-year-olds not only go to preschool in the morning but study French or gymnastics after lunch. One teacher tells of a four-year-old asking for help in the toilet before hurrying off to tennis. Another teacher says that children sometimes hold on to her at pickup time. What happened to unstructured time? A generous explanation is that we enjoy giving children opportunities we never had. The truth however is that many parents have doubts about how much time they spend away from their families. And one way to reduce this guilt is to believe that time spent in these classes is somehow more beneficial to children than the time we know we should be giving them ourselves. David Elkind, an expert on children, suggests that the 1960s gave birth to the belief that earlier is better. Parents hope that early music lessons, for example will build a child's confidence. The truth, however, is that any time children are asked to do too much, too soon, they are at greater risk for feelings of failure. A child's time does not have to be planned to be meaningful. Remember the lazy days of summer? Some children sleep late and play with the kids across the street until it's time to come home for dinner. However, with the majority of mothers working, fewer children enjoy that idle time now. Come September, children across the country will finish a full day of kindergarten, only to attend an after-school program until 6 P.M., when a working mom or dad comes to take them home. That's too much for a five-year old. Finances, of course, do limit some parents. But let's be honest with ourselves - our own busy schedules, whatever they involve, are no excuse for burdening a young child's.
Answer: children always say no to parents' advice
[A]:
The author holds that it's a challenge to plan a schedule for a child mainly because _ .