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．The disadvantages of working in an office.B．The waste produced in an office.C．To save resources when working in an office.D．How to save water in a restroom.
A．The disadvantages of working in an office.
B．The waste produced in an office.
C．To save resources when working in an office.
D．How to save water in a restroom.
单项选择题
A．A bank clerk and customer.B．Waiter and diner.C．Professor and student.D．Manger and secretary.
A．A bank clerk and customer.
B．Waiter and diner.
C．Professor and student.
D．Manger and secretary.
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