真正意义上代表现代社会保障制度的萌芽是19世纪30年代英国颁布并实施的______。
A.《济贫法》B.《社会保障法》C.《医疗保险法》D.《养老保险法》
参考答案:A
—I don't know _______ to do with this letter. May I give it to our teacher?
—I don't think so. You'd better not do it like this. [ ]
A. what
B. where
C. how
D. why
金融工程用于证券及衍生产品的交易,主要是开发具有套利性质的交易工具和交易策略。( )