Problem: Elevator:

As of January 2008, Spain is the nation with the most elevators installed in the world, with 950,000 elevators installed that run more than one hundred million lifts every day, followed by United States with 700,000 elevators installed and China with 610,000 elevators installed since 1949. In Brazil, it is estimated that there are approximately 300,000 elevators currently in operation. The world's largest market for elevators is Italy, with more than 1,629 million euros of sales and 1,224 million euros of internal market.

How many elevators had China installed since 1949?
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A: 610,000


Problem: West's fourth studio album, 808s & Heartbreak (2008), marked an even more radical departure from his previous releases, largely abandoning rap and hip hop stylings in favor of a stark electropop sound composed of virtual synthesis, the Roland TR-808 drum machine, and explicitly auto-tuned vocal tracks. Drawing inspiration from artists such as Gary Numan, TJ Swan and Boy George, and maintaining a "minimal but functional" approach towards the album's studio production, West explored the electronic feel produced by Auto-Tune and utilized the sounds created by the 808, manipulating its pitch to produce a distorted, electronic sound; he then sought to juxtapose mechanical sounds with the traditional sounds of taiko drums and choir monks. The album's music features austere production and elements such as dense drums, lengthy strings, droning synthesizers, and somber piano, and drew comparisons to the work of 1980s post-punk and new wave groups, with West himself later confessing an affinity with British post-punk group Joy Division. Rolling Stone journalist Matthew Trammell asserted that the record was ahead of its time and wrote in a 2012 article, "Now that popular music has finally caught up to it, 808s & Heartbreak has revealed itself to be Kanye’s most vulnerable work, and perhaps his most brilliant."
What types of instruments are present on his fourth album?
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Answer: dense drums, lengthy strings, droning synthesizers, and somber piano


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Backup and Restore, the backup component of Windows, is deprecated. It still ships with Windows 8 and continues to work on preset schedules, but is pushed to the background and can only be accessed through a Control Panel applet called "Windows 7 File Recovery".:76 Shadow Copy, a component of Windows Explorer that once saved previous versions of changed files, no longer protects local files and folders. It can only access previous versions of shared files stored on a Windows Server computer.:74 The subsystem on which these components worked, however, is still available for other software to use.:74
What does :67 Shadow Copy do?
A: unanswerable


Context and question: Copper has been used since ancient times as a durable, corrosion resistant, and weatherproof architectural material. Roofs, flashings, rain gutters, downspouts, domes, spires, vaults, and doors have been made from copper for hundreds or thousands of years. Copper's architectural use has been expanded in modern times to include interior and exterior wall cladding, building expansion joints, radio frequency shielding, and antimicrobial indoor products, such as attractive handrails, bathroom fixtures, and counter tops. Some of copper's other important benefits as an architectural material include its low thermal movement, light weight, lightning protection, and its recyclability.
How long has copper been used in building construction?
Answer: hundreds or thousands of years


Question: During the Cantonal Revolution of 1873, a cantonalist uprising that took place during the First Spanish Republic, the city was consolidated with most of the nearby cities in the Federal Canton of Valencia (proclaimed on 19 July and dissolved on 7 August). It did not have the revolutionary fervor of the movement in cities like Alcoy, as it was initiated by the bourgeoisie, but the Madrid government sent General Martinez-Campos to stifle the rebellion by force of arms and subjected Valencia to an intense bombardment. The city surrendered on 7 August; Alfonso XII was proclaimed king on 29 December 1874, and arrived in Valencia on 11 January 1875 on his way to Madrid, marking the end of the first republic. Despite the Bourbon restoration, the roughly even balance between conservatives and liberals in the government was sustained in Valencia until the granting of universal male suffrage in 1890, after which the Republicans, led by Vicente Blasco Ibáñez, gained considerably more of the popular vote.
Is there an answer to this question: Who was sent to stop Valencia's uprising?

Answer: General Martinez-Campos


Problem: Black people:

The concept of blackness in the United States has been described as the degree to which one associates themselves with mainstream African-American culture, politics, and values. To a certain extent, this concept is not so much about race but more about political orientation, culture and behavior. Blackness can be contrasted with "acting white", where black Americans are said to behave with assumed characteristics of stereotypical white Americans with regard to fashion, dialect, taste in music, and possibly, from the perspective of a significant number of black youth, academic achievement.

In what regards can one "act white"?
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A:
with regard to fashion, dialect, taste in music,