单项选择题


A．Cook Susan’s favorite food.
B．Buy a small gift for Susan.
C．Make a good excuse.
D．Get to Susan’s office immediately.
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单项选择题
Biotech can’t solve the problem of distributing food in developing nations because ______.
A．enough food can be produced to feed world population
B．the transport infrastructure in some countries are backward
C．biotech itself can not be distributed to these countries
D．farmers in those nations can not afford to buy the technology
填空题
exemplifies
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