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【单选题】
设关系R和S的个数分别为100和300，关系T是R与S的笛卡尔积，则T的个数是A.
400
B.
10000
C.
30000
D.
90000
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【单选题】—I have ____ here for two months. —So you ____ here since two months ago. [ ]
A.
come, came
B.
been, have been
C.
been, come
D.
come, have been
【简答题】求近似公式 的代数精度．
【单选题】Here 'two of my children' means ______.
A.
the two children of hers
B.
two students in her class
C.
two children of them
【简答题】_______'s play________________successfully portrays the Wingfields as a family of escapists who are indulged in their own illusory worlds.
【单选题】The town is about _________ ride from here.
A.
two hour
B.
two hour's
C.
two hours'
D.
two-hours
【单选题】The idea of opening a new cinema here was not wise, as there are two here already, _________ usually half-empty.
A.
neither
B.
none
C.
either
D.
both
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