61. What can be inferred from the water scientists warning?
A. The record drought forces half of the U. S. to go hungry.
B. The record drought drives up food prices m the U. S.
C. Severe food shortage may happen without proper measures.
D. A vegetarian diet is the only option to avoid disastrous shortages.
62. What do the scientists say can be done to increase food supply?
A. Grow more animal protein-rich food.
B. Turn pastures into arable lands.
C. Promote trade between countries self-sufficient in food.
D. Increase the amount of water for food production.
63. According to the water scientists report,
A. per capita food production has been increasing
B. reduced food supply will make more people malnourished
C. 70% of water will be used to feed 2 billion people by 2050
D. researchers begin to seek solutions to tackle water problem
64. In regard to the problem of water supply, scientists believe
A. more water should be allocated to satisfy energy demand
B. food production must be increased to 70% by mid-century
C. energy demand will intensify pressure on water resources
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