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【单选题】

Facebook owns which of the following?

A.
Pinterest
B.
Snapchat
C.
WhatsApp
D.
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参考解析:
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举一反三

【单选题】All of the following are examples of direct goods in the auto industry except:

A.
sheet steel.
B.
shatter-resistant glass.
C.
rubber molding.
D.
desktop computers.

【单选题】Along an indifference curve that bows inward, the marginal rate of substitution of a good ( )

A.
rises as the quantity of the good rises.
B.
decreases as the quantity of the good rises.
C.
remains the same as the quantity of the good rises.
D.
rises as the quantity of the good falls.