Problem: Sumer:

As is known from the "Sumerian Farmer's Almanac", after the flood season and after the Spring Equinox and the Akitu or New Year Festival, using the canals, farmers would flood their fields and then drain the water. Next they made oxen stomp the ground and kill weeds. They then dragged the fields with pickaxes. After drying, they plowed, harrowed, and raked the ground three times, and pulverized it with a mattock, before planting seed. Unfortunately the high evaporation rate resulted in a gradual increase in the salinity of the fields. By the Ur III period, farmers had switched from wheat to the more salt-tolerant barley as their principal crop.

What did farmers flood just before the new year?
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A: unanswerable

Problem: Egypt:

In 1975, Sadat shifted Nasser's economic policies and sought to use his popularity to reduce government regulations and encourage foreign investment through his program of Infitah. Through this policy, incentives such as reduced taxes and import tariffs attracted some investors, but investments were mainly directed at low risk and profitable ventures like tourism and construction, abandoning Egypt's infant industries. Even though Sadat's policy was intended to modernise Egypt and assist the middle class, it mainly benefited the higher class, and, because of the elimination of subsidies on basic foodstuffs, led to the 1977 Egyptian Bread Riots.

What tools did Infitah use to attract investment?
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A: reduced taxes and import tariffs

Problem: Indigenous peoples of the Americas:

While technically referring to the era before Christopher Columbus' voyages of 1492 to 1504, in practice the term usually includes the history of American indigenous cultures until Europeans either conquered or significantly influenced them, even if this happened decades or even centuries after Columbus' initial landing. "Pre-Columbian" is used especially often in the context of discussing the great indigenous civilizations of the Americas, such as those of Mesoamerica (the Olmec, the Toltec, the Teotihuacano, the Zapotec, the Mixtec, the Aztec, and the Maya civilizations) and those of the Andes (Inca Empire, Moche culture, Muisca Confederation, Canaris).

When was Columbus' first voyage?
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A: 1492

Problem: Chihuahua (state):

In the far eastern part of the state the Chihuahuan Desert dominates due to low precipitation and extremely high temperatures; some areas of the eastern part of the state are so dry no vegetation is found like the Sand Dunes of Samalayuca. There are two distinctive climate zones found in the eastern part of the state: Hot Desert (BWh) and Cool Desert (BWk) which are differentiated by average annual temperature due to differences in elevation. There is a transition zone in the middle of the state between the two extremely different climates from the east and west; this zone is the Steppe characterized by a compromise between juxtaposed climate zones.

Both types of climate zones in the eastern part of the state are what?
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A:
Desert