周固考研辅导讲义_大学英语阅读_大学英语-查字典英语网

周固考研辅导讲义

　　C. illegal aliens come into the U.S. with the help of complicated smuggling networks

　　D. American border strategy may fail to attain its goal of avoiding a SARS epidemic

　　50. The passage is primarily concerned with _____________________.

　　A. the threat of SARS to the national security of U.S.

　　B. the U.S. border strategy against SARS

　　C. the problems in U.S. national security

　　D. the crisis of a public health emergency

　　Passage 3

　　As the American West enters its fifth year of drought -- the longest stretch in 108 years -- the regions cities are instituting sweeping water-usage restrictions and conservation programs. In Aurora, Colo., where the reservoir system is at just 26% capacity and is expected to reach only half of normal levels by summer, planting new trees and shrubs is prohibited, and privately owned pools may not be filled.

　　In the thirsty, growing cities of Southern California, however, simple conservation simply wont do the trick. This region imports more than 80% of its water from neighboring states. And even though it jealously guards those arrangements, they wont be enough to compensate for the rapid growth that lies just ahead: San Diego Countys population alone is projected to rise about 29% by 2020, from 2.84 million to 3.67 million.