41题 C段
①How do archaeologists know where to find what they are looking for when there is nothing visible on the surface of the ground? ②Typically, they survey and sample (make test excavations on) large areas of terrain to determine where excavation will yield useful information. ③Surveys and test samples have also become important for understanding the larger landscapes that contain archaeological sites.
A段
①Some archaeological sites have always been easily observable—for example, the Parthenon in Athens, Greece; the pyramids of Giza in Egypt; and the megaliths of Stonehenge in southern England. ②But these sites are exceptions to the norm. ③Most archaeological sites have been located by means of careful searching, while many others have been discovered by accident. ④Olduvai Gorge, an early hominid site in Tanzania, was found by a butterfly hunter who literally fell into its deep valley in 1911. ⑤Thousands of Aztec artifacts came to light during the digging of the Mexico City subway in the 1970s.
问：C选项中的what they are looking for指的是文中哪部分内容？
A : archaeologists
B : test excavations
C : archaeological sites
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