单项选择题

Americans are eating ______ vegetable per person today as they did in 1910.

A．more than twice
B．twice more
C．as twice
D．more than twice as many
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单项选择题
He comes back to his hometown to see his parents at regular ______.
A．gaps
B．pauses
C．intervals
D．spans
单项选择题
I bought a quart of milk and six ______ at the market.
A．corn's ears
B．ears of com
C．corn ears
D．ears of corns
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