单项选择题

I don't think it's sensible of you to ______ your greater knowledge in front of the chairwoman, for it may well offend her.

A．show up
B．show off
C．show out
D．show away
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单项选择题
Largely due to the university tradition and the current academic milieu, every college student here works ______.
A．industrially
B．industriously
C．consciously
D．purposefully
单项选择题
The degree of downward slope of a beach depends on its composition of deposits as well as on the action of waves across its surface.
A．sentiment
B．sediment
C．semester
D．segment
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