单项选择题

A．elementary
B．crucial
C．rudimentary
D．fundamental
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单项选择题
A．knownB．definedC．calledD．referred to
A．known
B．defined
C．called
D．referred to
单项选择题
A．made up ofB．consisted ofC．constituted ofD．made from
A．made up of
B．consisted of
C．constituted of
D．made from
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