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.

[Q]: 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.
[A]: Where was the writer when the tragedy took place?

[Q]: Article: Google Glass, a wearable computer, will not go on sale for many months. But the resistance is already under way. The glasses-like device, which allows users to access the Internet, take photos and shoot videos, has been banned by a bar in Seattle, because according to the bar' owner, the bar was "kind of a private place." Besides, large parts of Las Vegas will not welcome wearers. Google Glass is a pair of glasses with a tiny computer attached to the right earpiece and has the ability to capture any chance encounter and broadcast it to millions. As personal technology becomes increasingly invisible, it is causing questions of whether it will rob people of privacy. As Google sees it, Glass is a revolutionary new way to quickly and effortlessly connect people with information. Google stresses that Glass is a work in its early stage, with test versions now being released to 2,000 developers. The company hopes they'll be seen as normal and become accepted in the same way smart phones are. The wearer has to speak or touch the device to activate it, and must look directly at someone to take a photograph or video of them. "We are thinking very carefully about how we design Glass because new technology always raises new issues," said Courtney Hohne, a Google spokeswoman. Critics view Glass as an unfriendly new technology that could rob people of what few privacy they have left. They think Google is downplaying the privacy and security risks. According to Google, it's obvious when someone is taking pictures or recording a video on Glass. Developers, however, are pushing the limits. One created a small sensation in tech circles with a program that eliminated the need for gestures or voice commands. To snap a picture, all the user needed to do was wink . Imagine a surveillance device that you could wear on your body all day without anyone being the wiser. Out on the street, in the subway, at a bar or cafe, people would never know whether the stranger next to them is secretly recording their every move. It is really a privacy disaster.
Answer: Google Glass is just as normal as a smart phone.
[A]: According to Google Company, which of the following statements about Google Glass is NOT true?

[Q]: Article: There are various ways in which individual economic units can interact with one another. Three basic ways may be described as the market system, the administered system, and the traditional system. In a market system individual economic units are free to interact among each other in the marketplace. It is possible to buy commodities from other economic units or sell commodities to them. In a market, transactions may take place via barter or money exchange. In a barter economy, _ goods such as automobiles, shoes, and pizzas are traded against each other. Obviously, finding somebody who wants to trade my old car in exchange for a sailboat may not always be an easy task. Hence, the introduction of money as a medium of exchange eases transactions considerably. In the modern market economy, goods and services are bought or sold for money. An alternative to the market system is administrative control by some agency over all transactions. This agency will issue commands as to how much of each good and service should be produced, exchanged, and consumed by each economic unit. Central planning may be one way of administering such an economy. The central plan, drawn up by the government, shows the amounts of each commodity produced by the various firms and allocated to different households for consumption. This is an example of complete planning of production, consumption, and exchange for the whole economy. In a traditional society, production and consumption patterns are governed by tradition; every person's place within the economic system is fixed by parentage, religion, and custom. Transactions take place on the basis of tradition, too. People belonging to a certain group or caste may have an obligation to care for other persons, provide them with food and shelter, care for their health, and provide for their education. Clearly, in a system where every decision is made on the basis of tradition alone, progress may be difficult to achieve. An inactive society may result.
Answer: To outline contrasting types of economic systems.
[A]:
What is the main purpose of the passage?