单项选择题

A．Replacing the native corn with the hybrid corn.
B．Replacing the hybrid corn with the native corn.
C．Replacing the new type of corn with the traditional corn.
D．Replacing the traditional corn with the native corn.
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单项选择题
A．They are planning a picnic for the department.B．They are having a picnic organized by the department.C．They are discussing how to escape from the sun.D．They are drinking and talking about the weather.
A．They are planning a picnic for the department.
B．They are having a picnic organized by the department.
C．They are discussing how to escape from the sun.
D．They are drinking and talking about the weather.
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