题目内容：
根据下面资料，回答题 A．Some archaeological sites have always been easily observable--for example, the Parthenon inAthens, Greece, the pyramids of Giza in Egypt; and the megaliths of Stonehenge in southern
England．But these sites are exceptions to the norm．Most archaeological sites have been located by means of careful searching, while many others have been discovered by accident．Olduvai Gorge, an early hominid site in Tanzania, was found by a butterfly hunter who literally fell into its deep valley in 1911．Thousands of Aztec artifacts came to light during thedigging of the Mexico City subway in the 1970s．
B．In another case, American archaeologists Rene Million and George Cow gillspent years systematically mapping the entire city of Teotihuacan in the Valley of Mexico near what is now
Mexico City．At its peak around AD 600, this city was one of the largest human settlementsin the world．The researchers mapped not only the city' s vast and ornate ceremonial areas,but also hundreds of simpler apartment complexes where common people lived．
C．How do archaeologists know where to find what they are looking for when there is nothingvisible on the surface of the ground? Typically, they survey and sample (make test excavations on) large areas of terrain to determine where excavation will yield useful information．
Surveys and test samples have also become important for understanding the larger landscapesthat contain archaeological sites．
D．Surveys can cover a single large settlement or entire landscapes．In one case, many researchers working around the ancient Maya city of Cohan, Honduras, have located hundreds ofsmall rural villages and individual dwellings by using aerial photographs and by making surveys on foot．The resulting settlement maps show how the distribution and density of the ruralpopulation around the city changed dramatically between AD 500 and 850, when Cohancollapsed．
E．To find their sites, archaeologists today rely heavily on systematic survey methods and a variety of high-technology tools and techniques．Airborne technology．es, such as different types ofradar and photographic equipment carried by airplanes or spacecraft, allow archaeologists tolearn about what lies beneath the ground without digging．Aerial surveys locate general areasof interest or larger buried features, such as ancient buildings or fields．
F．Most archaeological sites, however, are discovered by archaeologists who have set out to lookfor them．Such searches can take years．British archaeologist Howard Carter knew that thetomb of the Egyptian pharaoh Stankhumanexisted from information found in other sites．Carter sifted through rubble in the Valley of the Kings for seven years before he located thetomb in 1922．In the late 1800s British archaeologist Sir Arthur Evan combed antique dealers'stores in Athens, Greece．He was searching for tiny engraved seals attributed to the ancient
Mycenaean culture that dominated Greece from the 1400s to 1200s BC．Evans' s interpretations of these engravings eventually led him to find the Minoan palace at Knossos (Knoss6s)on the island of Crete, in 1900．
G．Ground surveys allow archaeologists to pinpoint the places where digs will be successful．Most ground surveys involve a lot of walking, looking for surface clues such as small fragments of pottery．They often include a certain amount of digging to test for buried materials atselected points across a landscape．Archaeologists also may locate buried remains by usingsuch technologies as ground radar, magnetic field recording, and metal detectors．Archaeologists commonly use computers to map sites and the landscapes around sites．Two and threedimensional maps are helpful tools in planning excavations, illustrating how sites look, andn resentingthe results of archaeological research．
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