单项选择题

A．It has a beautiful scenery.
B．The lions there are all locked.
C．The monkeys there are very entertaining.
D．It is in a very remote place with wild animals.
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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.
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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