单项选择题

The discussion was so prolonged and exhausting that ______ the speakers stopped for refreshments.

A．at large
B．at intervals
C．at ease
D．at random
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单项选择题
The purpose of a ______ is to cut down imports in order to protect domestic industry and workers from foreign competition.
A．tax
B．toll
C．fee
D．tariff
单项选择题
If the profits in one year are not sufficient to pay the dividend, the ______ will be paid from the profits of later year.
A．arrear
B．debt
C．difference
D．margin
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