A.area
B.field
C.research
D.occupation
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe
[单选题]To be a successful speaker, it is essential for you to know why you are spe