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

单项选择题The meeting was ______ over by the mayor to discuss the toll of crossing the bridges in Wuhan.

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.