单项选择题

Though computer has many advantages, it is by no means without its ______.

A. limitations
B. refrain
C. confinements
D. boundaries
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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
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
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