单项选择题

After briefly ______the history of the author, Prof. Li turnes to the novel itself immediately.

A．dipping in
B．dipping at
C．dipping into
D．dipping to
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单项选择题
Millions of workers were on the streets in the greatest______ of working class solidarity this country has ever seen.
A．demonstration
B．explanation
C．presentation
D．communication
单项选择题
Watching me pulling the calf awkwardly to the barn, the Irish milkmaid fought hard to ______her laughter.
A．hold back
B．hold on
C．hold out
D．hold up
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