照明装置由（）等组成，保障安全作业。
A.工作照明灯
B.探照灯
C.警示灯
D.标志灯
参考答案：A, B, C, D
Could you describe the speaker’s recent activity
A．He’s never lonely, for he has worked in his own company.
B．He started a business after he had gained some experience.
C．He’s upset about his own business for three years.
D．He needed to spend three more years working with the IT firm.
证券自营业务买卖的对象包括( )。
A．股票
B．债券
C．权证
D．证券投资基金
