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
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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
单项选择题
It can cause a hip or wrist ______ from a simple fall, and it decreases life expectancy because it is the leading cause of accidental death in people aged forty-five to seventy-four.
A．fraction
B．segment
C．fragment
D．fracture
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