单项选择题

An ambulance must have priority as it usually has to deal with some kind of ________.

A． urgency
B．danger
C．emergency
D．crisis
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单项选择题
The government gave a very ________ explanation of its plan for economic development.
A． comprehensive
B．compound
C． considerable
D．complacent
单项选择题
What is the top priority of NASA's mission
A． A tear in one of the station's solar wings.
B． A spacewalk on Thursday.
C．Get new equipment.
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