【简答题】If you feel at present that you don ’ t have enough friends in your life, one reason may be that you have let yourself become too busy to make time for the relationships you already have. Starting and...
【单选题】Water problems in the future will become more intense and more complex. Our increasing population will tremendously increase urban wastes, primarily sewage. On the other hand, increasing demands for w...
A.
to acquaint the reader with water pollution problems
B.
to alert the reader to the dwindling water supply
C.
to explain industrial uses of water
D.
to demonstrate various measures to solve the pollution problem
【简答题】Water problems in the future will become more intense and more complex. Our increasing population will tremendously increase wastes, primarily sewage. On the other hand, increasing demands for w...
【单选题】Humanity uses a little less than half the water available worldwide. Yet occurences of shortages and droughts (干旱)are causing famine and distress in some areas, and industrial and agricultural by-prod...
A.
The world population is increasing faster and faster.
B.
Half of the world's water resources have been seriously polluted.
C.
Humanity has not placed sufficient value on water resources.