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【单选题】
观察法的缺点或局限性在于它的（）A.
可靠性
B.
有效程度
C.
说服力
D.
时间弹性
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反馈参考答案：
举一反三
【单选题】If the cross-price elasticity between two goods is negative, the two goods are likely to be
A.
luxuries.
B.
necessities.
C.
complements.
D.
substitutes.
【简答题】常见的托盘有 ( )、不锈钢托盘、( )、 木质托盘等。
【单选题】If two goods are perfect substitutes, then the indifference curves for those two goods would be
A.
upward sloping and concave to the origin.
B.
downward sloping and convex to the origin.
C.
downward sloping and straight.
D.
L-shaped.
【单选题】Two goods are complements if the:
A.
price elasticity of each is greater than one.
B.
income elasticity of each is negative.
C.
cross-price elasticity is negative.
D.
cross-price elasticity is positive.
【单选题】The difference between the control group and the experimental group was______.
A.
the training that parents received
B.
the age of the children
C.
the books that were read
D.
the number of the children
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