单选题As indicated in the passage, the water problem _____.A has been exaggerated by some experts in the fieldB is underestimated by government organizations at different levelsC poses a challenge to the technology of building reservoirsD is already serious
题目
单选题
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