知识背景下思维方式的特征是( )。

单项选择题According to the writer of the article, the two words 'harmonization' and 'standardization'______.A.often refer to the same thingB.are rather different in that they originated from different sourcesC.always mean the same thingD.occasionally refer to the same thing

单项选择题某公司的股票现在的市价是80元，有一股以该股票为标的资产的看涨期权，执行价格为85，到期时间为6个月。6个月以后股价有两种可能：上升25％或者降低20％，则套期保值比率为（ ）。