2007职称英语（理工类）模拟试题(2)

　　31. What is the real cause of the potential water crisis? ________.

　　A. Only half of the worlds water can be used.

　　B. The world population is increasing faster and faster.

　　C. Half of the worlds water resources have been seriously polluted.

　　D. Humanity has not placed sufficient value on water resources.

　　32. As indicated in the passage, the water problem ________.

　　A. is already serious in certain parts of the world

　　B. has been exaggerated by some experts in the field

　　C. poses a challenge to the technology of building reservoirs

　　D. is underestimated by government organizations at different levels

　　33. According to the author, the water price should ________.

　　A. be reduced to the minimum

　　B. stimulate domestic demand

　　C. correspond to its real value

　　D. take into account the occurrences of droughts

　　34. The author says that in some hot and dry areas it is advisable to ________.

　　A. build big lakes to store water

　　B. construct big pumping stations

　　C. build small and cheap irrigation systems

　　D. channel water from nearby rivers to cropland

　　35. In order to raise the efficiency of the water supply, measures should be taken to ________.

　　A. guarantee full protection of the environment

　　B. centralize the management of water resources

　　C. increase the sense of responsibility of agencies at all levels

　　D. encourage local and regional control of water resources