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【判断题】
完全竞争厂商使用要素的原则是VMP=wA.
正确
B.
错误
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【简答题】Economics, several courses of which I have taken thus far, ______ to be difficult but useful for all students. (prove)
【单选题】This semester, the courses Williams has taken are History, Mathematics, Chemistry and Physics, Mathematics ______ the most important.
A.
is
B.
being
C.
has been
D.
of
【简答题】What courses has he taken?
【简答题】What are the courses Martin has taken?
【简答题】A．He thinks he's taken too few courses. B．He thinks he's taken too ninny courses. C．He doesn't think he has taken enough courses. D．He thinks the number of the courses he's taken is just right.
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