_______ application of transgenic technology（转基因技术）should be restricted on all food  production and the government should take _______ “scientific attitude” toward genetically modified food.

A．The ; a

B．An; the

C．The; the

D．An; a

评价经营效果并非仅比较一下收益率就行了，还要衡量证券组合所承担的风险。