单项选择题

Stressful environment leads to unhealthy behaviors such as Ix)or eating habits, which ______ increase the risk of high blood pressure and heart disease.

A．in turn
B．by chance
C．by fortune
D．in case
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单项选择题
The meeting was ______ over by the mayor to discuss the toll of crossing the bridges in Wuhan.
A．propelled
B．presumed
C．presided
D．pricked
单项选择题
The private detective, having received new information from a confidential source, narrowed down the ______ of his enquiry into the case.
A．aspect
B．sphere
C．dimension
D．scope
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