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 o funds for stem cell research.
A．reference
B．contradiction
C．explanation
D．rejection
单项选择题
California seems to be the home of the homeless since many are often observed tramping along railroad tracks and through the downtown areas of the cities.
A．roaming
B．trimming
C．stealing
D．stamping
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