B) Half of the worlds water resources have been seriously polluted.
C) Humanity has not placed sufficient value on water resources.
D) Only half of the worlds water can be used.
22. As indicated in the passage, the water problem ________.
A) has been exaggerated by some experts in the field
B) is underestimated by government organizations at different levels
C) poses a challenge to the technology of building reservoirs
D) is already serious in certain parts of the world
23. According to the author, the water price should ________.
A) correspond to its real value
B) be reduced to the minimum
C) stimulate domestic demand
D) take into account the occurrences of droughts
24. 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) channel water from nearby rivers to cropland
D) build small and cheap irrigation systems
25. In order to raise the efficiency of the water supply, measures should be taken to ________.
A) centralize the management of water resources
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