单项选择题

If we want to feed the world's population in 2050, our food production needs ______.

A．to increase by 30 percent
B．an increase of 300 percent
C．to increase to 3 billion tons per year
D．an increase of three times
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单项选择题
It can be inferred from the passage that ______.
A．it is estimated that there will be no food produced by conventional agriculture
B．people haven't been aware of the health benefits of reduced pesticide use
C．a genetic revolution will be one of methods to increase food supplies
D．GM food will be too expensive for people to accept
单项选择题
What does the author suggest by referring to the lesson of personal computers
A．GM food will ultimately enter into the diet of commons.
B．GM food is similar to personal computers in some aspects.
C．Like personal computers, GM food will become indispensable to people.
D．GM food is one of the achievements of high technology.
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