单项选择题

A．but
B．while
C．and
D．however
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单项选择题
A．designed byB．defined asC．designed asD．defined by
A．designed by
B．defined as
C．designed as
D．defined by
单项选择题
A．inB．onC．withD．from
A．in
B．on
C．with
D．from
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