单项选择题

复制某个股票指数的一般方法不包括( )。

A.分层抽样法
B.最优化法
C.方差最小化法
D.时间序列法
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多项选择题
目前涉及中国领土主权问题的国内法律法规主要包括:()相关条款中所规定的一些原则性法律规定。

A.《中华人民共和国宪法》
B.《中华人民共和国缔结条约程序法》
C.《中华人民共和国反分裂法》
D.《中华人民共和国缔约法》

单项选择题
M: If you had waited until after the Christmas holidays, you could have bought that dress for much less.W: I know that, but I needed it immediately. I had a wedding reception to attend.When had the woman purchased the dress?()

A.Shortly after Christmas.
B.In the spring.
C.During the Christmas season.
D.During the sale.

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