Problem: Please answer a question about the following article about Indigenous peoples of the Americas:
The specifics of Paleo-Indian migration to and throughout the Americas, including the exact dates and routes traveled, provide the subject of ongoing research and discussion. According to archaeological and genetic evidence, North and South America were the last continents in the world with human habitation. During the Wisconsin glaciation, 50–17,000 years ago, falling sea levels allowed people to move across the land bridge of Beringia that joined Siberia to north west North America (Alaska). Alaska was a glacial refugia because it had low snowfall, allowing a small population to exist. The Laurentide Ice Sheet covered most of North America, blocking nomadic inhabitants and confining them to Alaska (East Beringia) for thousands of years.
What confined the nomadic inhabitants to East Beringia for thousands of years?
A: Laurentide Ice Sheet
Problem: Please answer a question about the following article about Light-emitting diode:
By the late 1990s, blue LEDs became widely available. They have an active region consisting of one or more InGaN quantum wells sandwiched between thicker layers of GaN, called cladding layers. By varying the relative In/Ga fraction in the InGaN quantum wells, the light emission can in theory be varied from violet to amber. Aluminium gallium nitride (AlGaN) of varying Al/Ga fraction can be used to manufacture the cladding and quantum well layers for ultraviolet LEDs, but these devices have not yet reached the level of efficiency and technological maturity of InGaN/GaN blue/green devices. If un-alloyed GaN is used in this case to form the active quantum well layers, the device will emit near-ultraviolet light with a peak wavelength centred around 365 nm. Green LEDs manufactured from the InGaN/GaN system are far more efficient and brighter than green LEDs produced with non-nitride material systems, but practical devices still exhibit efficiency too low for high-brightness applications.[citation needed]
What LEDs are more efficient when produced from the InGaN/GaN systems than without?
A: Green
Problem: Please answer a question about the following article about New Delhi:
New Delhi has a population of 249,998. Hindi and Punjabi are the most widely spoken languages in New Delhi and the lingua franca of the city. English is primarily used as the formal language by business and government institutes. New Delhi has a literacy rate of 89.38% according to 2011 census, which is highest in Delhi.
What language is used for formal purposes by business and government institutes of New Delhi?
A: English
Problem: Please answer a question about the following article about North Carolina:
Besides slaves, there were a number of free people of color in the state. Most were descended from free African Americans who had migrated along with neighbors from Virginia during the 18th century. The majority were the descendants of unions in the working classes between white women, indentured servants or free, and African men, indentured, slave or free. After the Revolution, Quakers and Mennonites worked to persuade slaveholders to free their slaves. Some were inspired by their efforts and the language of the Revolution to arrange for manumission of their slaves. The number of free people of color rose markedly in the first couple of decades after the Revolution.
After the revolution Quakers and mennonited encouraged slaveholders to do what?
A:
free their slaves