单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Computer literacy.
B．English literature.
C．TOEFL training.
D．Chinese culture.
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单项选择题
How much genetically modified corn was planted in the US last year
A．More than half.
B．65 million acres.
C．One third.
D．Three quarters.
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