选择题:The shopkeepers are complaining that business has

题目内容:
The shopkeepers are complaining that business has been reduced to a ________ of what it was before the outbreak of war.
(A) fraction
(B) section
(C) portion
(D) trifle
参考答案:

(单选题2分)机会成本是指()。(A)作出某项选择时实际支付的费用或损失(B)企业生产与经营中的各种

(单选题2分)机会成本是指()。(A)作出某项选择时实际支付的费用或损失(B)企业生产与经营中的各种实际支出(C)作出一项选择时所放弃的其他若干种可

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