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听力原文：M: I' ve been home in bed all week. It' s going to be hard catching up without notes.
W: Would you like to use mine.
What is the woman willing to do？
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How does the driver figure out that the passenger is a first-time visitor to the city？
Inflation is an economic condition in【C1】______prices for consumer goods【C2】______, and the【C3】______of money or purchasing power decreases. There arc three important causes of inflation. The first and most important cause may be excessive government spending. For example, in order to【C4】______a war or carry【C5】______social programs, the government may spend more money than it has received through taxes and other revenue, thus creating a deficit. In order to【C6】______this deficit, the Treasury Department can simply【C7】______the money supply by issuing more paper money to【C8】______the debts of government. This increase in the money supply will cause the value of the dollar to【C9】______decrease. The second cause of inflation occurs when the money supply increases faster than the supply of goods.【C10】______people have more money, they will run out to buy popular goods【C11】______televisions and computers, for example, and a shortage will result. Industry will then produce more, at higher prices, to【C12】______demand.【C13】______, if people think that the prices of popular goods are going up, they will buy and even borrow money at high【C14】______rates to pay for them. Finally, if labor unions demand that workers, wages【C15】______to【C16】______the high cost of living, industry will meet this demand and add other costs of production on to the【C17】______.【C18】______summary, all of these causes can【C19】______inflationary problems that can affect the welfare of a nation. However, of these three causes,【C20】______government spending may be the most important.
【C1】
For what reason did the black walnut tree become popular during the colonial period？
When the Dutch first sailed up the Hudson River 300 years ago, they discovered black walnut trees so large that the first branch was as much as 70 feet above the ground. In colonial times the black walnut became one of America's first exports, because it was highly prized by cabinetmakers. During World War I almost all natural woods of the black walnut were eliminated. Trees were harvested for gun stocks, and even the nutshells were collected to use as filtering material in gas masks.
Today, growing black walnut trees is profitable because of the demand for it. However, not every black walnut tree is necessarily valuable. It must be inspected to see if it meets certain standards. Furthermore, the roots of the black walnut tree produce a poisonous substance that will cause harm to tomatoes, potatoes, blackberries and apples.
Why is the black walnut tree so valuable7
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