[Q]: Sentence: The language was first introduced in North America when Russian explorers voyaged into Alaska and claimed it for Russia during the 1700s. Question: When did Russian explorers first reach North America?
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[A]: yes

[Q]: Sentence: Solar radiation is absorbed by the Earth's land surface, oceans which cover about 71% of the globe and atmosphere. Question: How much of the earth is covered by oceans?
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[A]: yes

[Q]: Sentence: For a scrimmage to be valid the team in possession of the football must have seven players, excluding the quarterback, within one yard of the line of scrimmage. Question: How close to the line of scrimmage can defensive players approach before a play is run?
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[A]:
yes