单项选择题

The idea of a balanced diet is hard to ______ to those who know nothing about nutriology.

A．put across
B．put through
C．put down
D．put forward
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单项选择题
He asked no one's permission; he did it ______ his own account.
A．for
B．with
C．on
D．from
单项选择题
We always lay in a large ______ of tinned food in winter in case we are snowed up.
A．proportion
B．storage
C．provision
D．supply
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