单项选择题

Supported by sufficient evidence, his argument seems to have a great deal of ______.

A．vividness
B．validity
C．terminology
D．propagation'
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单项选择题
That winter was quite long and farmers who had failed to store up enough ______ for their cattle almost went bankrupt.
A．fodder
B．food
C．grass
D．grain
单项选择题
Your service is entirely ______ not compulsory.
A．selective
B．optional
C．voluntary
D．reluctant
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