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
It was an allusion to what the scientist thought was an inappropriate distribution of funds for stem cell research.
A．reference
B．contradiction
C．explanation
D．rejection
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