单项选择题

I am ______ of his chances of passing the examination because he has no! worked hard enough.

A．ambiguous
B．ambitious
C．dubious
D．rational
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单项选择题
When a body is ______ in a fluid it apparently loses weight.
A．displaced
B．indulged
C．dispersed
D．immersed
单项选择题
She studies many books about fashion, entertaining and correct social behavior as she wants to appear ______.
A．fashionable
B．elegant
C．sophisticated
D．polished
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