单项选择题

The word "premise" ( Line 3, Para. 1) probably means "______"

A．assumption
B．promise
C．need
D．crisis
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单项选择题
Companies don' t want to spend money on research in developing appropriate crops in Africa because
A．existing technology fails to grow dry-land crops
B．only dozens of years later can they make profits
C．they are not encouraged and probably cannot make any profit
D．most of African countries belong to the third world
单项选择题
The author's attitude towards water crisis is ______.
A．concerned
B．indifferent
C．critical
D．detached
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