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发布时间:2023-10-22 22:19:50

[单项选择]If the cross-price elasticity of demand for two goods is negative, these two good are ()
A. Luxury goods.
B. Necessities.
C. Substitutes.
D. Complements.

更多"If the cross-price elasticity of de"的相关试题:

[简答题]需求交叉弹性(cross elasticity of demand)
[单项选择]If the price elasticity of demand for a good is 4.0, then a 10 percent increase in price would result in a:( )
A. 4% decrease in the quantity demanded.
B. 10% decrease in the quantity demanded.
C. 40% decrease in the quantity demanded.
[单项选择]

Passage Two
Global energy demand is expected to triple by mid-century. The earth is unlikely to run out of fossil fuels by then, given its vast reserves of coal, but it seems unthinkable that we will continue to use them as we do now. It’s not just a question of supply and price, or even of the disease caused by filthy air. The terrorist assault on the World Trade Center raises other scary scenarios: how much easier would it be to crack open the Trans-Alaska pipeline and how much deadlier would it be to bomb a nuclear plant than to attack a wind arm
Skeptics may recall the burst of enthusiasm for conservation and renewable power when oil prices quadrupled in the 1970s. State-funded energy research and development surged, while tax incentives boosted solar, wind and other alternatives to petroleum and the atom. But when oil supplies loosened and prices dropped in the early 1990s, governments lost interest. In the state of California, subsidies evaporat
A. it will do great harm to the inadequate reserves of coal
B. it is deadly if terrorists attack a nuclear plant
C. it will limit the development of many other alternatives
D. there will be a wider gap between developed and developing countries

[单项选择]Passage Two Do you go to bed without brushing your teeth You may think that not brushing is not a big deal. But caring for your mouth can prevent serious (and even embarrassing) problems. Cavities happen to just about everyone. A cavity is a diseased spot in the tooth. It all starts with a sticky film made up of bacteria. That film coats your teeth and gums. The bacteria eat sugars from things you eat and drink. That produces acids. Then, the acids eat away at your teeth’s hard outer coating, called enamel. If you don’t brush regularly to remove the film, or if you keep missing a spot, those acids keep eating away the teeth’s enamel. That is how you get a cavity. "The larger it gets, the closer it gets to the nerve, increasing the chance of severe pain," says Lynn Ramer, president of the American Dentists’ Association. A cavity will never just go away by itself. It will only get worse. "Left untreated, 100 percent of the time a cavity will spread," says Dr.
A. a diseased spot in the tooth
B. a film of acids coating the teeth
C. a sticky film made up of bacteria
D. a hard outer coating covering the teeth
[单项选择]Passage Two
Analysts have had their go at humor, and I have read some of this interpretative literature, but without being greatly instructed. Humor can be dissected, as a frog can, but the thing dies in the process and the innards (内在部分) are discouraging to any but the pure scientific mind.
In a newsreel theatre the other day I saw a picture of a man who had developed the soap bubble to a higher point than it had ever before reached. He had become the ace soap bubble blower of America, had perfected the business of blowing bubbles, refined it, doubled it, squared it, and had even worked himself up into a convenient lather. The effect was not pretty. Some of the bubbles were too big to be beautiful, and the blower was always jumping into them or out of them, or playing some sort of unattractive trick with them. It was, if anything, a rather
A. just as scientists can dissect a frog, so analysts can dissect humor
B. detailed, scientific analysis is not appropriate for humor, for it may make humor lose its aesthetic value
C. some people’s analysis of humor are too scientific
D. analysts’ attempts at humor am not instructive enough to interest the author

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