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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If you have questions about rent guidelines, maintenance codes, or your rights and responsibilities, contact your__________.
单项选择题
The chief concern of British universities is________.
A．how to tackle their present financial difficulty
B．how to expand the enrollment to meet the needs of enterprises
C．how to improve their educational technology
D．how to put an end to the current tendency of quality deterioration
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