单项选择题

The elderly and small babies are most _________ to the dangers of hot weather.

A．subjective
B．subordinate
C．liable
D．vulnerable
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单项选择题
In _________ between commercial parties, the constraints are usually non-existent or vague.
A．transactions
B．transmissions
C．transitions
D．transformations
单项选择题
Everyone involved in this matter should make a _________ not to leak the secret.
A．pledge
B．warranty
C．assurance
D．guarantee
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