单项选择题

He was so ______ on his book that he didn't find her come in.

A. intent
B. absorbed
C. engrossed
D. devoted
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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
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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