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.
<上一题 目录 下一题>
热门 试题

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.
单项选择题
What did the expansion of fields in the First World War lead to
A．A serious drought.
B．A reduction in price.
C．Soaring wheat prices.
D．Extinction of rattlesnakes.
相关试题