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【单选题】
设R是一个2元关系，有3个，s是一个3元关系，有4个。如T=RX S，则T的为（ ）个。A.
6
B.
8
C.
12
D.
16
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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】在我国，监督宪法实施的国家机关是（ ）。
【简答题】What are the courses Martin has taken?
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