单项选择题


A．former
B．formula
C．formal
D．formative
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单项选择题
Which of the following docs the author use as an example of a product whose price has decreased due to changes in technology
A．Grandfather clocks.
B．Steel.
C．Record players.
D．Minerals.
单项选择题
With which of the following topics is the author primarily concerned
A．The effects of climate on the economy.
B．The relation between market prices and technological change.
C．The effect of shifts in supply and demand on market prices.
D．The increasing cost of skilled labor.
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