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．$2.0.B．$2.5.C．$5.0.D．$1.25.
A．$2.0.
B．$2.5.
C．$5.0.
D．$1.25.
单项选择题
No one lives in the region of the lakes.
A．Y
B．N
C．NG
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