单项选择题

A scanner is an ______ device which enables you to feed pictures, photos or documents into a computer system.

A．ambiguous
B．ingenious
C．intrinsic
D．rigorous
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单项选择题
We ______ that diet is related to most types of cancer, but we don't have definite proof.
A．assure
B．suspect
C．ascertain
D．assert
单项选择题
It is a common ______ : Should you stay where you have friends and family, or take that good job in a far-away city
A．perplexity
B．paradox
C．bewilderment
D．dilemma
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