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【简答题】
（）蜗壳基本上不用在污水泵中。
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反馈参考答案：
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
【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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