单项选择题
Cattle raising is not necessarily a profitable business because
A.the demand is too low
B.the supply is too large
C.the cost is too high
D.the price is changeable
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单项选择题The Ivy League, the group, of old private north-eastern universities, include ______________. and some others.
A.Harvard, Yale, Cambridge
B.Harvard, Yale, Columbia
C.Harvard, Yale, Stanford
D.Harvard, Stanford, Columbia