单项选择题

A．5 per cent.
B．25 per cent.
C．15 per cent.
D．10 per cent.
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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.
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.
单项选择题
A．For scientific study.B．For field guides.C．For entertainment.D．For some film background sounds.
A．For scientific study.
B．For field guides.
C．For entertainment.
D．For some film background sounds.
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