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: Seven years ago I was 13 years old. I still remember to this day where I was and how it all came down. I was in my social studies classroom, when a teacher came back and told us that the first building of the World Trade Center was hit by a plane. We immediately stopped our work and turned on the television. Throughout half the day we watched TV until the school was forced to let all of us home early. I walked home and immediately turned on the television and watched until my bedtime. I remember always seeing the towers walking to my Tae Kwon Do school; to me, a boy teenager, it was a great thing because at that time I have never seen any other building that caught my eye as much as _ did. And walking to my school that day was just a horrifying dream. Crossing the busy road of the Bell Pike was a big cloud of smoke and dust. It was very upsetting. Every day after that horrific day I looked up to the once stood Twin Towers just to see nothing there. To my eyes, that day will always be in my mind and in my heart, even though I didn't lose any loved ones, I still feel the pain as if I did. September 11th, 2001 will never be forgotten.
Answer: He was in the classroom.

Answer: Where was the writer when the tragedy took place?

Question: Article: Born on April 4, 1928, Maya Angelou had a hard childhood. Her parents got divorced when she was very young. She was a single mother and being a single mother was very hard on her. It was finally in 1949 that she started to find her place in the world when she changed her name to show her Calypso dance performances at the night club where she worked. It was there that she won a scholarship and trained in African dance and modern dance. She formed a group and they traveled all over Europe with an opera production. As she traveled, she studied different languages and became excellent in several of them. During this time, she made her first album, Miss Calypso, and it was a success. In the 1950s, she moved to New York and started to work more on her writing. She heard Dr Martin Luther King speak in 1960 and began organizing different benefits for Civil Rights . In 1961, she began to play a large role in the Civil Rights Movement and is remembered for her work around the country. She later moved to Ghana with her son and worked in the University of Ghana's School of Music and Drama. It was there that she became close friends with Malcolm X. She returned to the US in 1964 to help Malcolm X with a new Civil Rights movement. Shortly after she returned to the US, Malcolm X and Dr King were both assassinated . To deal with the deaths of her friends, she wrote her first book, I Know Why the Caged Bird Sings, which finally made her famous around the world. The 1970s were some of her most productive years as a writer, poet, as well as a singer.
Answer: Maya Angelou: a life of hard work and success

Answer: What's the main idea of this passage?

Question: Article: Redwood trees are the tallest plants on the earth,reaching heights of up to 100 meters.They are also known for their longevity,typically 500 to 1000 years,but sometimes more than 2000 years.A hundred million years ago,in the age of dinosaurs,redwoods were common in the forests of a much more moist and tropical North America.As the climate became drier and colder,they declined to a narrow strip along the Pacific coast of Northern Califomia. The trunk of redwood trees is very strong and usually forms a single straight column.It is covered with a soft bark.This bark can be pretty thick,well over two feet in the more mature trees.It gives the older trees a certain kind of protection from insects,but the main benefit is that it keeps the center of the tree harmless from moderate forest fires because of its thickness.This fire resistant quality explains why the giant redwood grows to live that long.While most other types of trees are destroyed by forest fires,the giant redwood actually prospers because of them. Moderate fires will clear the ground of competing plant life,and the rising heat dries and opens the ripe fruit of the redwood,releasing many thousands of seeds onto the ground below. New trees are often produced from shoots,little baby trees,which form at the base of the trunk.These shoots grow slowly,fed by the root system of the "mother'' tree.When the main tree dies,the shoots are then free to grow as full trees,forming a "fairy ring" of trees around the original tree.These trees,in turn,may give rise to more shoots,and the cycle continues.
Answer: The temperature was lower along the Pacific coast.

Answer:
Why were redwood trees easier to find in the forests of North America millions of years ago?