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【多选题】
必要氮损失（Obligatory nitrogen loses，ONL） 包括A.
皮肤、毛发和黏膜脱落
B.
妇女月经期失血
C.
肠道菌群死亡
D.
未消化吸收的蛋白质经粪便排出
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举一反三
【判断题】Economists at the U.S. Department of the Treasury help design U.S. coins and paper money.
A.
正确
B.
错误
【简答题】B Economists usually study markets．Now，two Americans have won the Nobel Prize in economics for not studying markets．They will share almost one and a half million dollars for their ysis of economic...
【判断题】Economists usually have to make do with whatever data the world happens to give them.
A.
正确
B.
错误
【单选题】Economists usually use GDP rather than GNP because they are tracking:
A.
only transactions on the current account.
B.
only transactions on the financial account.
C.
production rather than income.
D.
income rather than production.
【单选题】Economists tend to ignore children because
A.
economists cannot gather statistics about children.
B.
children contribute little to the economy.
C.
there are restrictions on the data that governments will let them collect.
【单选题】Victor __________at school on Sundays．
A.
usually is
B.
is usually
C.
are usually
D.
usually are
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