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单项选择题

The study of how we do things with words is the study of ______.

A．entailment
B．presupposition
C．speech acts
D．metaphor
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单项选择题Which of the following cities is called the cradle of American liberty

A．Boston.
B．New York.
C．Philadelphia.
D．Washington.

单项选择题Charlotte Bronte's masterpiece is ______. A. Jane Eyre B, Wuthering Heights C. Tess of d'Urbervilles D. Agnes Grey

Charlotte Bronte's masterpiece is ______. A. Jane Eyre B, Wuthering Heights C. Tess of d'Urbervilles D. Agnes Grey