What is the meaning of the word sharp in the sentence “There is a sharp contrast between the lives of the poorest and the richest members of society”？
A. clear
B. pointed
C. sudden
D. fashionable
下列哪种情况应该扩大保护区的范围（)。
A. 汽车火灾现场
B. 起火部位尚未确定的
C. 雷击火灾现场
D. 有自燃物的火灾现场
The book is ______. You should have returned it to the library last week.
A. due
B. overdue
C. expired
D. exceeded
公安机关消防机构负责立案侦查的案件有哪些？
A. 失火案
B. 消防责任事故案
C. 放火案
D. 重大责任事故案
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