单项选择题

In the U. S. , it is common that each state ______ its power to an elected or appointed state board of education.

A．exercises
B．applies
C．adjusts
D．delegates
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单项选择题
The wind was so strong that it tore the flag ______.
A．by half
B．at half
C．in half
D．by halves
单项选择题
The performance of a particular project is usually analyzed ______ customers needs.
A．in terms of
B．in search of
C．by means of
D．in case of
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