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
Comparison and contrast are often used ______ in advertisements.
A．intentionally
B．pertinently
C．incidentally
D．tiresomely
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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