单项选择题

Chinese meteorologists on Wednesday said the development of China's own climate system model was ______ to its national security strategy.

A．crucial
B．inventive
C．innovative
D．systematic
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单项选择题
They did not find ______ to prepare for the worst conditions they might meet.
A．worth they while
B．it worthwhile
C．it worth
D．it worthy
单项选择题
In Nigeria, rules have been handed down orally from generation to generation and now form the country's ______ law.
A．traditional
B．conventional
C．customary
D．conservative
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