贫富差距问题会造成社会的不安全,这应该靠谁来进行保障?()
A.个人
B.企业
C.家庭
D.社会
参考答案:D
Police are searching for an escaped criminal who is reported to _____ since he broke away from the prison.
A.have been missing
B.have lost
C.be missing
D.get lost
作图题:画出信号灯及一般照明灯符号图。