单项选择题

I am ______ of his chances of passing the examination because he has not worked hard enough.

A．ambiguous
B．ambitious
C．dubious
D．rational
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单项选择题
Medieval travelers' tales of fantastic creatures were often fascinating but not always ______.
A．creditable
B．imaginable
C．credible
D．conceivable
单项选择题
It is ______ in Western countries to give people gifts on their birthdays.
A．coherent
B．customary
C．cooperative
D．cumulative
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