单项选择题

By ______ computation, he estimated that the repairs on the house would cost him $2,000.

A. coarse
B. rude
C. crude
D. rough
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单项选择题
Her silence is an indication of his disapproval.
A. testimony
B. statement
C. suggestion
D. announcement
单项选择题
At first, the delivery of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expenses, it became a reality.
A． transaction
B． transmission
C． transition
D． transformation
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