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The Heian period was preceded by the Nara period and began in 794 A.D after the movement of the capital of Japan to Heian-kyo (present day Kyoto), by the 50th emperor, Emperor Kanmu. Kanmu first tried to move the capital to Nagaoka-kyo, but a series of disasters befell the city, prompting the emperor to relocate the capital a second time, to Heian. The Heian Period is considered a high point in Japanese culture that later generations have always admired. The period is also noted for the rise of the samurai class, which would eventually take power and start the feudal period of Japan.
What was the name of the emperor who moved Japan's capital to Heian?
A: Kanmu

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The Sichuan government raised the minimum wage in the province by 12.5 percent at the end of December 2007. The monthly minimum wage went up from 400 to 450 yuan, with a minimum of 4.9 yuan per hour for part-time work, effective 26 December 2007. The government also reduced the four-tier minimum wage structure to three. The top tier mandates a minimum of 650 yuan per month, or 7.1 yuan per hour. National law allows each province to set minimum wages independently, but with a floor of 450 yuan per month.
What did the top tier reduce the four-tier minimum wage structure to?
A: unanswerable

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With the record company a global operation in 1965, the Columbia Broadcasting System upper management started pondering changing the name of their record company subsidiary from Columbia Records to CBS Records.
In 1955, CBS was a global what?
A: unanswerable

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AA gunnery was a difficult business. The problem was of successfully aiming a shell to burst close to its target's future position, with various factors affecting the shells' predicted trajectory. This was called deflection gun-laying, 'off-set' angles for range and elevation were set on the gunsight and updated as their target moved. In this method when the sights were on the target, the barrel was pointed at the target's future position. Range and height of the target determined fuse length. The difficulties increased as aircraft performance improved.
What was the problem with AA gunnery?
A:
successfully aiming a shell to burst close to its target's future position