文勇的新托福黄金&ccedil

Inmostpeopletheleftsideofthebodyismorevulnerabletoinju

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Unformatted text preview: in the passage refers to the explanation for why ○the southern Maya areas received more rainfall than the northern areas ○modern archaeologists have difficulty understanding ancient droughts ○water problems were most severe in the wet south ○land surface in the south is so high above the water table 6. Which of the following statements about the availability of water in the Mayan homeland is supported by paragraph 3? ○The construction of wells was an uncommon practice in both the north and the south because it was too difficult to dig through the karst. ○In most areas in the north and the south, rainwater was absorbed directly into the porous karst. ○The water table was an important resource for agriculture in both the north and the south of the Yucatan Peninsula, ○The lack of surface water in both the north and the south was probably due to the fact that most of it was quickly used up for agricultural purposes. 7. According to paragraph 3, why was the southern Mayan homeland hard to farm? ○The presence of numerous sinkholes and wells interfered with farming. ○Southern soil lacked the depth crops needed for growth. ○Underground water was too far below the surface to reach. ○The presence of karst caused frequent flooding. Paragraph 4: How did those dense southern Maya populations deal with the resulting water problem? It initially surprises us that many of their cities were not built next to the rivers but instead on high terrain in rolling uplands. The explanation is that the Maya excavated depressions, or modified natural depressions, and then plugged up leaks in the karst by plastering the bottoms of the depressions in order to create reservoirs, which collected rain from large plastered catchment basins and stored it for use in the dry season. For example, reservoirs at the Maya city of Tikal held enough water to meet the drinking water needs of about 10,000 people for a period of 18 months. At the city of Coba the Maya built dikes around a lake in order to raise its level and make their water supply more reliable. But the inhabitants of Tikal and other cities dependent on reservoirs for drinking water would still have been in deep trouble if 18 months passed without rain in a prolonged drought. A shorter drought in which they exhausted their stored 398 [email protected] 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 food supplies might already have gotten them in deep trouble, because growing crops required rain rather than reservoirs. 8 Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. ○Southern Maya populations obtained the water they needed for the dry season by collecting and storing rainwater in sealed depressions. ○The Maya are credited with creating methods for modifying natural rainwater and storing it. ○Leaks in...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.

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