单项选择题

A．She will go through the physics test with the man.
B．She will help the man to do some physical exercise.
C．She will help the man to solve these physics problems.
D．She will review the physics problems with the man.
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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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