Problem: Please answer a question about the following article about Anti-aircraft warfare:
Unlike the heavier guns, these smaller weapons are in widespread use due to their low cost and ability to quickly follow the target. Classic examples of autocannons and large caliber guns are the 40 mm autocannon and the 8.8 cm FlaK 18, 36 gun, both designed by Bofors of Sweden. Artillery weapons of this sort have for the most part been superseded by the effective surface-to-air missile systems that were introduced in the 1950s, although they were still retained by many nations. The development of surface-to-air missiles began in Nazi Germany during the late World War II with missiles such as the Wasserfall, though no working system was deployed before the war's end, and represented new attempts to increase effectiveness of the anti-aircraft systems faced with growing threat from [bomber]s. Land-based SAMs can be deployed from fixed installations or mobile launchers, either wheeled or tracked. The tracked vehicles are usually armoured vehicles specifically designed to carry SAMs.
When were the surface-to-air missile systems introduced?
A: 1950s
Problem: Please answer a question about the following article about Mary (mother of Jesus):
Mary's special position within God's purpose of salvation as "God-bearer" (Theotokos) is recognised in a number of ways by some Anglican Christians. All the member churches of the Anglican Communion affirm in the historic creeds that Jesus was born of the Virgin Mary, and celebrates the feast days of the Presentation of Christ in the Temple. This feast is called in older prayer books the Purification of the Blessed Virgin Mary on February 2. The Annunciation of our Lord to the Blessed Virgin on March 25 was from before the time of Bede until the 18th century New Year's Day in England. The Annunciation is called the "Annunciation of our Lady" in the 1662 Book of Common Prayer. Anglicans also celebrate in the Visitation of the Blessed Virgin on 31 May, though in some provinces the traditional date of July 2 is kept. The feast of the St. Mary the Virgin is observed on the traditional day of the Assumption, August 15. The Nativity of the Blessed Virgin is kept on September 8.
What is another name for the feast of the Presentation of Christ in the Temple in the Anglican Communion?
A: the Purification of the Blessed Virgin Mary
Problem: Please answer a question about the following article about The Blitz:
Although it had equipment capable of doing serious damage, the problem for the Luftwaffe was its unclear strategy and poor intelligence. OKL had not been informed that Britain was to be considered a potential opponent until early 1938. It had no time to gather reliable intelligence on Britain's industries. Moreover, OKL could not settle on an appropriate strategy. German planners had to decide whether the Luftwaffe should deliver the weight of its attacks against a specific segment of British industry such as aircraft factories, or against a system of interrelated industries such as Britain's import and distribution network, or even in a blow aimed at breaking the morale of the British population. The Luftwaffe's strategy became increasingly aimless over the winter of 19401941. Disputes among the OKL staff revolved more around tactics than strategy. This method condemned the offensive over Britain to failure before it began.
What year did the OKL become aware that Britain would be a possible target?
A: early 1938
Problem: Please answer a question about the following article about Russian language:
Significant Russian-speaking groups also exist in Western Europe. These have been fed by several waves of immigrants since the beginning of the 20th century, each with its own flavor of language. The United Kingdom, Spain, Portugal, France, Italy, Belgium, Greece, Brazil, Norway, and Austria have significant Russian-speaking communities. According to the 2011 Census of Ireland, there were 21,639 people in the nation who use Russian as a home language. However, of this only 13% were Russian nationals. 20% held Irish citizenship, while 27% and 14% were holding the passports of Latvia and Lithuania respectively.
How many people in Ireland speak Russian?
A:
21,639