单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．They work at the zoo.
B．They are going to do some artwork.
C．They enjoy watching elephants.
D．They are going to feed the elephants.
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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
The author uses the phrase from steed to nightgowns when discussing adverse effects on production to ______.
A．indicate that a wide variety of goods are affected
B．describe the two products that suffer the most
C．show how increased prices for agricultural products affected other prices
D．support the argument that cities suffer more than agricultural areas
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