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单项选择题
重度贫血的血红蛋白含量为A.<90g/LB.<70g/LC.<60g/LD.<50g/LE.<30g/L
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问答题
The theory of[填空1] holds that a commodity will be produced in the country where it costs least in terms of resources; while the theory of [填空2] holds that even if a country is less efficient than another in the production of both commodities, there is still a basis for mutually beneficial trade.
答案：
第1空:absolute advantage 第2空:comparative advantage
