单项选择题

When traveling, it is possible that you may be advised to take the travelers' checks, which provide a secure ________ to carrying your money in cash.

A．selection
B．preference
C．alternative
D．substitute
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It is a legal ________ for parents to ensure that their children are provided with efficient education suitable to their age.
A．sympathy
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The disappearance of her paper has never been ________.
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