Unformatted text preview: ultural products from the region uncompetitive on the national and international markets. Somewhat more promising have been recent experiments for releasing capillary water (water in the soil) above the water table by injecting compressed air into the ground. Even if this process proves successful, 119
[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
however, it would almost triple water costs. Genetic engineering also may provide a partial solution, as new strains of droughtresistant crops continue to be developed. Whatever the final answer to the water crisis may be, it is evident that within the High Plains, irrigation water will never again be the abundant, inexpensive resource it was during the agricultural boom years of the midtwentieth century. Paragraph 1 在 The vast grasslands of the High Plains in the central United States were settled by farmers and ranchers in the 1880’s. This region has a semiarid climate, and for 50 years after its settlement, it supported a low
intensity agricultural economy of cattle ranching and wheat farming. In the early twentieth century, however, it was discovered that much of the High Plains was underlain by a huge aquifer (a rock layer containing large quantities of groundwater). This aquifer was named the Ogallala aquifer after the Ogallala Sioux Indians, who once inhabited the region.
1在According to paragraph 1, which of the following statements about the High Plains is true? ○Until farmers and ranchers settled there in the 1880’s, the High Plains had never been inhabited.
○The climate of the High Plains is characterized by higherthanaverage temperatures.
○The large aquifer that lies underneath the High Plains was discovered by the Ogallala Sioux Indians.
○Before the early 1900’s there was only a small amount of farming and ranching in the High Plains.
Paragraph 2 在 The Ogallala aquifer is a sandstone formation that underlies some 583,000 square kilometers of land extending from northwestern Texas to southern South Dakota. Water from rains and melting snows has been accumulating in the Ogallala for the past 30,000 years. Estimates indicate that the aquifer contains enough water to fill Lake Huron, but unfortunately, under the semiarid climatic conditions that presently exist in the region, rates of addition to the aquifer are minimal, amounting to about half a centimeter a year.
2. According to paragraph 2, all of the following statements about the Ogallala aquifer are true EXCEPT: ○The aquifer stretches from South Dakota to Texas.
○The aquifer’s water comes from underground springs.
○Water has been gathering in the aquifer for 30,000 years.
○The aquifer’s water is stored in a layer of sandstone.
3. 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. ○Despite the current impressive size of the Ogallala...
View Full Document
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.
- Fall '13