单项选择题

Mrs. Brown couldn't shake the ______ that these kids were in deep trouble and it was up to her to help them.

A．conversion
B．conviction
C．conservation
D．convention
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单项选择题
Nothing is so uncertain as the fashion market where one style ______ over another before being replaced.
A．dominates
B．manipulates
C．overwhelms
D．prevails
单项选择题
The ______ of lung cancer is particularly high among long-term heavy smokers, especially chain smokers.
A．incident
B．accident
C．incidence
D．evidence
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