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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He comes back to his hometown to see his parents at regular ______.
A. gaps
B. pauses
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We are flying at a(an) ______ of 20,000 feet.
A. altitude
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