不定项选择

Gamma为负的Delta中性投资组合的持有者，喜欢标的资产大幅波动。

A．正确
B．错误

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单项选择题

Changes in the social structure may indirectly _____ juvenile crime rates. … Families have also experienced changes these years. This lack of parental supervision is thought to be an influence on juvenile crime rates.

A．affect
B．reduce
C．check
D．reflect

单项选择题

In international trade, the claim only occurs between the seller and the buyer.

A．对
B．错