Problem: PlayStation 3:

Following speculation that Sony was working on a 'slim' model, Sony officially announced the PS3 CECH-2000 model on August 18, 2009, at the Sony Gamescom press conference. New features included a slimmer form factor, decreased power consumption, and a quieter cooling system. It was released in major territories by September 2009. As part of the release for the slim model, the console logo ceased using the "Spider-Man font" (the same font used for the title of Sony's Spider-Man 3) and the capitalized PLAYSTATION 3. It instead reverted to a more traditional PlayStation- and PlayStation 2-like 'PlayStation 3' logo with "PS3" imprinted on the console. Along with the redesigning of the console and logo, the boot screen of all consoles changed from "Sony Computer Entertainment" to "PS3 PlayStation 3", with a new chime and the game start splash screen being dropped. The cover art and packaging of games was also changed.

What was the model number of the slim version of the PlayStation 3?
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A: CECH-2000

Problem: Since the opening policy in 1979, the Chinese department stores also develops swiftly along with the fast-growing economy. There are different department store groups dominating different regions. For example, INTIME department store has the biggest market presence in Zhejiang province, while Jinying department stores dominate Jiangsu Province. Besides, there are many other department store groups, such as Pacific, Parkson, Wangfujing,New World,etc., many of them are expanding quickly by listing in the financial market.
What area does INTIME department stores have the most influence in?
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Answer: Zhejiang province

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In many ways, the Paleocene continued processes that had begun during the late Cretaceous Period. During the Paleocene, the continents continued to drift toward their present positions. Supercontinent Laurasia had not yet separated into three continents. Europe and Greenland were still connected. North America and Asia were still intermittently joined by a land bridge, while Greenland and North America were beginning to separate. The Laramide orogeny of the late Cretaceous continued to uplift the Rocky Mountains in the American west, which ended in the succeeding epoch. South and North America remained separated by equatorial seas (they joined during the Neogene); the components of the former southern supercontinent Gondwana continued to split apart, with Africa, South America, Antarctica and Australia pulling away from each other. Africa was heading north toward Europe, slowly closing the Tethys Ocean, and India began its migration to Asia that would lead to a tectonic collision and the formation of the Himalayas.
Which ocean was closed when Africa moved northward during the Paleocene?
A: Tethys

Context and question: Jethro Burns, best known as half of the comedy duo Homer and Jethro, was also the first important jazz mandolinist. Tiny Moore popularized the mandolin in Western swing music. He initially played an 8-string Gibson but switched after 1952 to a 5-string solidbody electric instrument built by Paul Bigsby. Modern players David Grisman, Sam Bush, and Mike Marshall, among others, have worked since the early 1970s to demonstrate the mandolin's versatility for all styles of music. Chris Thile of California is a well-known player, and has accomplished many feats of traditional bluegrass, classical, contemporary pop and rock; the band Nickel Creek featured his playing in its blend of traditional and pop styles, and he now plays in his band Punch Brothers. Most commonly associated with bluegrass, mandolin has been used a lot in country music over the years. Some well-known players include Marty Stuart, Vince Gill, and Ricky Skaggs.
Who popularized the mandolin in Western Swing Music?
Answer: Tiny Moore

Question: The essence of air defence is to detect hostile aircraft and destroy them. The critical issue is to hit a target moving in three-dimensional space; an attack must not only match these three coordinates, but must do so at the time the target is at that position. This means that projectiles either have to be guided to hit the target, or aimed at the predicted position of the target at the time the projectile reaches it, taking into account speed and direction of both the target and the projectile.
Is there an answer to this question: What is the first purpose of air defence?

Answer: detect hostile aircraft

Problem: Tajikistan:

Tajikistan means the "Land of the Tajiks". The suffix "-stan" (Persian: -stan) is Persian for "place of" or "country" and Tajik is, most likely, the name of a pre-Islamic (before the seventh century A.D.) tribe. According to the Library of Congress's 1997 Country Study of Tajikistan, it is difficult to definitively state the origins of the word "Tajik" because the term is "embroiled in twentieth-century political disputes about whether Turkic or Iranian peoples were the original inhabitants of Central Asia."

What is most likely the name of a pre-Indian tribe?
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A:
unanswerable