问答题

As consumers’ incomes increase, the demand for ground beef decreases. Ground beef is called a(n):

答案： A.substitute good.
B.complement good.
C.normal good....

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单项选择题

在水泥混凝土中,粗集料是指粒径大于 ( )的碎石、砾石和破碎砾石
A、5.0mm
B、2.5mm
C、4.75mm
D、2.36mm

If the demand for computers shifts to the right as consumers’ incomes rise, computers are

答案： A.inferior goods.
B.normal goods.
C.complement goods...