Regional water shortages will become more severe． In the 1970—2000 period population growth will cause requirements to double in nearly half the world． Still greater increases would be needed to improve standards of living． Development of new water supplies will become more costly virtually everywhere．
Extinction（灭绝） of plants and animal species will increase dramatically.
Hundreds of thousands of species will be inevitably lost as their natural surroundings vanish， especially in tropical forests．

7） In spite of increased output of goods，__________
A． people will have some difficulty in finding jobs
B． the world s resources will become scarce in the near future
C． people will be poorer in 2000 than they are today
D． the living standards of the growing population will be improved at a great rate

8）As the prices for food increase，________.
A． People in less developed countries will be faced with energy problems
B． the economies of the industrialized countries will have to develop on end
C． less developed countries are sure to rai se the output of food production
D． the large gap between the rich and poor remains unchanged

9） In order to improve living standards， it would be necessary ________．
A． to make population slow down
B． to control pollution immediately
C． to save various kinds of plants and animals urgently
D． to develop new water supplies

10） What is the best title of the passage?
A． Keeping the Balance of Ecology
B． Visions of the Future
C． Exploiting Resources of the Future
D． Avoiding the World s Economic Crisis

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