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
The child was so ingenuous that even when she knocked the television off its stand so that it was irreparably damaged, her parents thought her to be charming.
A．intelligent
B．ingenious
C．adroit
D．naive
单项选择题
A rapid portfolio turnover rate may preclude low long-term capital gains.
A．prohibit
B．lag
C．prevent
D．reject
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