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【单选题】
（）是指根据物料之间的结构组成关系，由独立派生出来的、和对应的产品相关联的需求。A.
独立需求
B.
特殊需求
C.
普通需求
D.
相关需求
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反馈参考答案：
举一反三
【单选题】Egg prices usually ________ in spring when they are most plentiful.
A.
are dropping
B.
drop
C.
have dropped
D.
will drop
【单选题】I usually go shopping in that supermarket, because their prices are _____.
A.
expensive
B.
cheap
C.
high
D.
low
【判断题】The perfume medicine bags for children during Dragon Boat Festival are usually filled with magwort and calamus.
A.
正确
B.
错误
【单选题】Prices usually reflect
A.
only the value of a good to society.
B.
only the cost to society of making a good.
C.
both the value of a good to society and the cost to society of making the good.
D.
neither the value of a good to society nor the cost to society of making the good.
【单选题】House prices vary from place to place and are usually high ________ there are famous schools.
A.
when
B.
since
C.
where
D.
whether
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