单项选择题

One of the roles which science plays is that of ______ superstition.

A．cover up
B．casting out
C．building up
D．fence off
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单项选择题
Once the novelty of watching TV and videos all day has ______, there is nothing to do.
A．worn away
B．worn down
C．worn off
D．worn out
单项选择题
Studies have shown that smoking is a factor for gastric cancer either by itself, or more ______ when in combination with another factor such as coal dust exposure or the consumption of alcohol.
A．tentatively
B．potently
C．relentlessly
D．jointly
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