单项选择题

A．explore how nose works
B．find ways to treat deformed noses
C．study the relation between nostrils and smelling power
D．find ways to deal with smelling problems
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单项选择题
A．Some incidents had demonstrated its security problem.B．The Royal family found it necessary to do so.C．The House of Parliament proposed to do so.D．The European Union suggested it doing so.
A．Some incidents had demonstrated its security problem.
B．The Royal family found it necessary to do so.
C．The House of Parliament proposed to do so.
D．The European Union suggested it doing so.
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