单项选择题

In the early 20th century, at the advent of the telephone, it was considered a superfluous instrument which would never be of practical use in the average household.

A. appearance
B. popularity
C. dominance
D. consolidation
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单项选择题
Training programs for the U.S. Peace Corps are conducted in the country or region () the volunteer will serve.

A. and
B. or
C. that is
D. where
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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