单项选择题

Tom could hardly ______ his excitement as he knew that he had made a real discovery.

A．conceal
B．reveal
C．show
D．discover
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单项选择题
There has been an increase in attendance at lectures ______ by the World Affairs Council, which brings international issues to public attention.
A．developed
B．sponsored
C．advanced
D．promoted
单项选择题
We must try to ______ the best of our moral values for our children and grandchildren.
A．replace
B．remain
C．generate
D．preserve
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