单项选择题

When traveling, you are advised to take traveler's checks, which provide a secure ______ to carrying your money in cash.

A．substitute
B．selection
C．preference
D．alternative
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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 case
D．at random
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